documentclass{beamer}
useoutertheme{infolines}
usecolortheme{beaver}
title{Title}
date{today}
%setbeamercolor{page number in head/foot}{fg=darkred!60!black}
begin{document}
begin{frame}
end{frame}
end{document}

setbeamercolor{page number in head/foot}{fg=darkred!60!black}