Why in LISP , there is no limitation for number?

Question

I can even calculate (expt 32768 32768) and I got:

47617047058164585203630504288757589154106580860755239912393038552191433338966834242068

Answer 1

Lisp automatically switches math to use a bignum package when it sees this kind of thing. But there is a limitation. Make your numbers big enough, and you may require more bits to represent it than there are atoms in the known universe. Then your system memory will probably be exhausted. :)