Maximum integer in Perl

Question

Set $i=0 and do ++$i while it increases. Which number we would reach?

Note that it may be not the same as maximum integer in Perl (as asked

Answer 1

Well, on my 64-bit machine it's 18446744073709551615 (much easier as ~0), after which it increases once more time to 1.84467440737096e+19 and stops incrementing.