# Why is 2^63 negative?

**URL:** <https://discourse.julialang.org/t/why-is-2-63-negative/48513>\
**Category:** New to Julia\
**Tags:** integer-overflow\
**Created:** [October 16, 2020, 7:18pm UTC](https://discourse.julialang.org/t/why-is-2-63-negative/48513 "2020-10-16T19:18:34Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![ericphanson](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ericphanson/32/215186_2.png) [@ericphanson](https://discourse.julialang.org/u/ericphanson)\
**Post date:** [October 16, 2020, 7:38pm UTC](https://discourse.julialang.org/t/why-is-2-63-negative/48513/4 "2020-10-16T19:38:27Z")

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> [@sylvaticus](#):
>
> using a “safe” version of Int64

Yep, that’s `SafeInt64` from [SaferIntegers.jl](https://github.com/JeffreySarnoff/SaferIntegers.jl)

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