[ 1:32:28.64] P:\test>perl -MMath::Pari=factorial -wle"print factorial( 19937 )"
2.174930234150431374566653166E77066

[ 1:32:30.58] P:\test>

##</code><code>##

[ 1:35:13.75] P:\test>perl -MMath::BigInt -wle"$n=Math::BigInt->new( 19937 ); print $n->bfac;"
2174930234150431374566653562545349453159548764005915598228287343243610
0399250094165681781366521424136575314821986705545783026313111819773987
2047105789330953704693263375025834056482446086707947547228857444817043

...
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0000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000

[ 1:37:02.13] P:\test>