No, 0xd6e8feb86659fd93ULL is a valid unsigned long long number. With stdint.h you'd get portable suffix macros, which would help on non-Windows, but they do look worse.
Oh wow, my apology - didn't know that and didn't notice the length of the hexademical number. TIL.
Oh wow, my apology - didn't know that and didn't notice the length of the hexademical number. TIL.