Adding the word "Chapter" before Chapter number using the quotchap package

Question

I am using the quotchap package and I wish to have the word "Chapter" before the Chapter number for example, instead of just having 1, I wish to have Chapter 1 and the remaining chapters to have this format and also Appendix A instead of just having A. This is a continuation of the question answered nicely by @Simon Dispa (https://tex.stackexchange.com/users/161015/simon-dispa) at Adding the word "Appendix" for all the Appendices chapters using the quotchap package .

Below is the my MWE:

\documentclass[11pt,openany,twoside]{book}  
\raggedbottom
\let\cleardoublepage=\clearpage
\usepackage[left=2.5cm, right=2.5cm, top=3cm, bottom=3cm,a4paper]{geometry}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[table]{xcolor}
\usepackage{graphicx}
\newcommand\HRule{\noindent\rule{\linewidth}{1.5pt}}
\usepackage[dotinlabels]{titletoc}
\usepackage{background}
\backgroundsetup{contents={}}
\usepackage{fancyhdr}
\usepackage{hhline}
\pagestyle{fancy} 
\usepackage[noindentafter,calcwidth]{titlesec}
\usepackage[courier]{quotchap}
\usepackage{helvet}
\renewcommand\sectfont{\bfseries}
\usepackage{calc,pifont} 
\usepackage{multirow}
\newcommand*\myheaderfooterfont{\normalfont\bfseries}
\usepackage[nottoc]{tocbibind}
\usepackage[ragged]{sidecap}
\usepackage[marginal]{footmisc}
\renewcommand\footnoterule{\vspace*{-3pt}%
    \hrule width 2in height 1.4pt \vspace*{2.6pt}}
\setlength\footnotemargin{10pt}
\usepackage{etoolbox}
\usepackage{regexpatch}
\usepackage{listings}
\usepackage{hyperref}
\hypersetup{
    colorlinks=true,
    linkcolor=blue,
}
\usepackage{apptools}
\begin{document} 
    \chapter{Backrre}
\end{document}

Answer 1

This is not hard to achieve, just patch the \@makechapterhead command. I think you may completely redefine it by yourself without using quotchap. Because it did exact same thing if you know how to redefine the \@makechapterhead. Anyway, I don't think the output is that pretty. So I also add some space between the heading and title name.

Edit: You could do this to change the font size.

\documentclass[11pt,openany,twoside]{book}  
\raggedbottom
\let\cleardoublepage=\clearpage
\usepackage[left=2.5cm, right=2.5cm, top=3cm, bottom=3cm,a4paper]{geometry}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[table]{xcolor}
\usepackage{graphicx}
\newcommand\HRule{\noindent\rule{\linewidth}{1.5pt}}
\usepackage[dotinlabels]{titletoc}
\usepackage{background}
\backgroundsetup{contents={}}
\usepackage{fancyhdr}
\usepackage{hhline}
\pagestyle{fancy} 
\usepackage[noindentafter,calcwidth]{titlesec}
\usepackage[courier]{quotchap}
\usepackage{helvet}
\renewcommand\sectfont{\bfseries}
\usepackage{calc,pifont} 
\usepackage{multirow}
\newcommand*\myheaderfooterfont{\normalfont\bfseries}
\usepackage[nottoc]{tocbibind}
\usepackage[ragged]{sidecap}
\usepackage[marginal]{footmisc}
\renewcommand\footnoterule{\vspace*{-3pt}%
    \hrule width 2in height 1.4pt \vspace*{2.6pt}}
\setlength\footnotemargin{10pt}
\usepackage{etoolbox}
\usepackage{regexpatch}
\usepackage{listings}
\usepackage{hyperref}
\hypersetup{
    colorlinks=true,
    linkcolor=blue,
}
\usepackage{apptools}
\usepackage{lipsum}
\makeatletter
\patchcmd{\@makechapterhead}{\thechapter}{{\fontsize{60}{80}\selectfont\chaptername}\hskip20pt\thechapter}{}{}
\patchcmd{\@makechapterhead}{\par}{\par\vspace{15pt}}{}{}
\makeatother
\begin{document} 
\chapter{Backrre}
\lipsum[1]
\end{document}

Answer 2

Try this code. It works with chapters and appendices.

You can change the font, color and position by modifying the definition of \chapname (and \appname accordingly)

% !TeX TS-program = pdflatex
\documentclass[11pt,openany,twoside]{book}

\usepackage[T1]{fontenc}% added <<<<<<
\raggedbottom
\let\cleardoublepage=\clearpage
\usepackage[left=2.5cm, right=2.5cm, top=3cm, bottom=3cm,a4paper]{geometry}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[table]{xcolor}
\usepackage{graphicx}
\newcommand\HRule{\noindent\rule{\linewidth}{1.5pt}}
\usepackage[dotinlabels]{titletoc}
\usepackage{background}
\backgroundsetup{contents={}}
\usepackage{fancyhdr}
\usepackage{hhline}
\pagestyle{fancy} 
\usepackage[noindentafter,calcwidth]{titlesec}
\usepackage[courier]{quotchap}
\usepackage{helvet}
\renewcommand\sectfont{\bfseries}
\usepackage{calc,pifont} 
\usepackage{multirow}
\newcommand\myheaderfooterfont{\normalfont\bfseries}
\usepackage[nottoc]{tocbibind}
\usepackage[ragged]{sidecap}
\usepackage[marginal]{footmisc}
\renewcommand\footnoterule{\vspace{-3pt}%
    \hrule width 2in height 1.4pt \vspace*{2.6pt}}
\setlength\footnotemargin{10pt}
\usepackage{etoolbox}
\usepackage{regexpatch}
\usepackage{listings}
\usepackage{hyperref}
\hypersetup{
    colorlinks=true,
    linkcolor=blue,
}
\usepackage[toc,header]{appendix}
\usepackage{apptools}
\usepackage{showframe}
%************************************************** added
\usepackage{xstring}
\makeatletter

    \patchcmd{@makechapterhead}{\thechapter}{%
     \IfSubStr{ABCDEFGHIJKLMNOPQRSTUVWXYZ}{\thechapter}{\appname,\thechapter}{\chapname,\thechapter}
    }

\makeatother
\newcommand{\appname}{{\fontfamily{phv}\fontsize{22pt}{26pt}\selectfont\raisebox{1em}{\textcolor{red}{Appendix}}}} % set the appendix name <<<<<<<<<<<
\newcommand{\chapname}{{\fontfamily{phv}\fontsize{22pt}{26pt}\selectfont\raisebox{1em}{\textcolor{red}{\chaptername}}}} % set the chapter name <<<<<<<<<<<
%**************************************************
\begin{document} 
    \frontmatter
    \chapter*{Ac}
    \addcontentsline{toc}{chapter}{Ac}
\mainmatter
\setcounter{tocdepth}{1}
\chapter{Backrre}
\setcounter{chapter}{14}
\chapter{Another chapter with \#15}

\begin{appendices}
    \chapter{Derivation of X}
    The contents...
    \chapter{Derivation of Y}
    Another content...
    \setcounter{chapter}{15}
    \chapter{Derivation of P}
    \setcounter{chapter}{25}
    \chapter{Derivation of Z}
    Another content...      
\end{appendices}

\backmatter


%   \bibliography{}
\end{document}