I'm finishing a book, and I want the first page of each chapter to begin with the literal numerotation:
Chapter one
...
Chapter two
...
chapter three
etc.
I've seen it in several books so I think it possible, but how?
A file example...in arabic
\documentclass[14pt,a4paper]{extbook}%{article}%
\usepackage{titlesec}
\usepackage{titletoc}
\usepackage{etoolbox}
\usepackage{multicol}
\usepackage{amsmath,amssymb}
\usepackage[most]{tcolorbox}
\usepackage{boxedminipage}
\usepackage{slashbox}
\usepackage{titlesec}
\usepackage{enumitem}
\usepackage{minitoc}
\usepackage{rotating}
\usepackage{fmultico}
\setlength{\columnseprule}{0.1pt}
\usepackage{fancyhdr}
\pagestyle{fancy}
\usepackage{pdflscape}
\usepackage{array}
\usepackage{polyglossia}
\setmainlanguage[numerals=maghrib]{arabic}
\setotherlanguage{english}
\newfontfamily\arabicfont[Script=Arabic, AutoFakeSlant=-0.02]{Amiri}
\setsansfont[Script=Arabic,Scale=1.5]{Amiri}
\gappto\captionsarabic{\renewcommand{\chaptername}{الباب}}
\begin{document}
\chapter{المحاكاة}
كيف يمكننا إيجاد احتمال الفوز في لعبة
\end{document}

titlesecor are you just loading it? If you have\titleformat{\chapter}..., then that's the place where action should be done. – egreg May 05 '14 at 18:07\titleformat{\chapter}[display] {\normalfont\huge\bfseries}{\chaptertitlename\ \thechapter}{20pt}{\Huge} \titlespacing{\chapter} {0pt}{40pt}{-10pt}
in my macros for contents.. and I don't understand what you're saying "that's the place where action should be done"..
– Faouzi Bellalouna May 06 '14 at 15:16\thechapterin\titleformat, use a macro like David defined, say\words{chapter}(and provide the definition). – egreg May 06 '14 at 15:55titletocseems not to work and makes an infinite loop. From David's code use only the definition of\wordsand don't add the changes to\@makechapterhead. – egreg May 06 '14 at 16:21