Am using the book environment and trying to print the chapter title as "Chapter One", instead of "Chapter 1". I've searched about the "cardinal" and "chapter", but I didn't find anything similar to what I want.
The problem is that am using the titlesec package:
\documentclass[12pt, oneside,a4paper]{book} % The default font size and one-sided printing (no margin offsets)
\usepackage{graphics}
\graphicspath{ {images/} } % Specifies the directory where pictures are stored
\usepackage{multirow}
\usepackage{booktabs} % Horizontal rules in tables
\usepackage{url}
\usepackage[font=large]{subcaption}
\usepackage[font=large]{caption}
\usepackage{pbox}
\usepackage[usenames,dvipsnames]{xcolor,colortbl}
\definecolor{PaleGreen}{HTML}{E6E6E6}
\usepackage{manyfoot} % NOTE: manyfoot and DeclareNewFootnote MUST be declared before the BibLatex package,
\DeclareNewFootnote{A} % otherwise, you get an error about no room for a new counter
% Vanilla footnotes: use \footnoteB
\DeclareNewFootnote{B}
\usepackage[backend=bibtex,
hyperref=true,
url=false,
isbn=false,
backref=false,
style=ieee,
citereset=chapter,
maxcitenames=3,
maxbibnames=100,
block=none]{biblatex}
%%%%%%%%%
% the command \sbc (short bracketed cite) defined below prints footnote citation with brackets
\newcommand{\sbc}[1]{\bfcite{#1}}
%%%%%%%%%
\usepackage{rotating}
\usepackage{libertine}
\usepackage[T1]{fontenc}
\title{\ttitle} % Defines the thesis title - don't touch this
\usepackage{titlesec}
\newcommand{\hsp}{\hspace{10pt}}
\definecolor{chapterSepLine}{HTML}{41B6c4}
\definecolor{chapterNumColor}{HTML}{212121}
\newcommand{\blackTBar}{{\color{black}\titlerule[0.75pt]}}
\newcommand{\royalBlueTBar}{{\color{chapterSepLine}\titlerule[0.75pt]}}
%--------- Chapter heading format ---------
\titleformat{\chapter}
[hang] % shape
{\center\LARGE\usefont{T1}{bch}{b}{n}\selectfont} % format
{{\color{chapterNumColor} {\chaptertitlename}~\thechapter}} % label
{0pt} % sep
{\center\Huge\bfseries } % before
[\hrule\vspace{1pt}\royalBlueTBar] % after
\titlespacing*{\chapter}{0pt}{-35pt}{40pt} % \titlespacing[*]{<command>}{<left>}{<before-sep>}{<after-sep>}[<right-sep>]
%--------- Section heading format ---------
\titleformat{\section}[hang]{
\usefont{T1}{bch}{b}{n}\selectfont} % bch for Bitstream Charter, and ppl for Palatino
{}
{0em}
{\hspace{-0.4pt}\Large \thesection\hspace{0.6em}}
%--------- Subsection heading format ---------
\titleformat{\subsection}[hang]{
\usefont{T1}{bch}{b}{n}\selectfont} % bch for Bitstream Charter, and ppl for Palatino
{}
{0em}
{\hspace{-0.4pt}\large \thesubsection\hspace{0.6em}}
%--------- paragraph heading format ---------
\titleformat{\paragraph}[runin]{
\usefont{T1}{bch}{b}{n}\selectfont} % bch for Bitstream Charter, and ppl for Palatino
{}
{0em}
{\hspace{-0.4pt}\large\hspace{0.6em}}
\usepackage[activate={true,nocompatibility},final,tracking=true,kerning=true,spacing=true,factor=1100,stretch=10,shrink=10]{microtype}
\renewcommand{\contentsname}{Table of Contents}
\usepackage{inconsolata} % monofont only, which replaces the current mono (Libertine) font
\makeatletter
\patchcmd{\@makechapterhead}{%
\huge\bfseries \@chapapp\space \thechapter}{ \huge\bfseries \@chapapp\space \Numberstring{chapter}}{}{}
\makeatother
\usepackage{fmtcount}%
\addbibresource{Bibliography.bib}
% ----------------------------------------------------------------
% BEGIN DOCUMENT
% ----------------------------------------------------------------
\begin{document}
\chapter{Hello}
\end{document}


fmtcountmight help, but the precise solution depends on the class. Please help us to help you and add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with\documentclass{...}and ending with\end{document}. – Oct 31 '14 at 08:58chapter number displaymight be a duplicate, the usage of thetitlesecdoes not make it duplicate of the question linked to by egreg... however, it might be a duplicate of some other question – Oct 31 '14 at 09:38