I looked shit up for you,
Miraculix:
SQLite supports SIGNED BIGINT as the largest integer, which means -9223372036854775808 <-> 9223372036854775807, that is -2**63 <-> 2**63-1.
This is the limit regardless of database engine ...
However, MySQL supports, in addition to the SIGNED BIGINT, UNSIGNED BIGINT, which is 0 <-> 18446744073709551615, meaning 2**64-1. In either case, SIGNED or UNSIGNED, reaching that number by normal gaming means doesn't happen fast, but it's far better than the 2+ billion limit imposed by 32-bit integer. Not to mention spending all that money ...
There's still hope, though, although it's 32-bit:
http://stackoverflow.com/questions/9...-integers-in-c
I'm sure you're better C++ coder than I am, so you should be able to figure this out. That link is for C++ on Linux, but it shouldn't be any different.