Unpopular opinion: i64, int64_t, Int64 and similar types should be named according to their actual meaning, Ring64.
Even better, all programming languages should have a Ring[N] type that provides unit, zero addition and multiplication over a domain of N-bit strings, with the compiler applying proper optimizations when available (and requested).
@Shamar except in C the result of signed overflow is undefined. So it's not a ring.
@Shamar and I also should mention that the vast majority of C programmers don't even know what a ring is.
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This however is NOT a good objection: it takes 10 minutes to understand rings building on insight from primary school.
