You could always buy some hardware with a 64-bit processor ;-)

Seriously now, if you want to do anything with the large number you obtain, you'll have little choice but to reimplement part of the Math::BigInt module. Even if you manage to produce it, performing any calculation with it simply won't work without special routines for arithmic.

I'd go with the module mentioned above if I were you. Hope this helps, -gjb-