On my computer:
jl> gamma(big(3.6e13))
Inf
jl> @which gamma(big(3.6e13))
gamma(x::BigFloat) in SpecialFunctions at C:\Users\dnf\.julia\packages\SpecialFunctions\mFAQ4\src\gamma.jl:578
On my computer:
jl> gamma(big(3.6e13))
Inf
jl> @which gamma(big(3.6e13))
gamma(x::BigFloat) in SpecialFunctions at C:\Users\dnf\.julia\packages\SpecialFunctions\mFAQ4\src\gamma.jl:578