unsigned long long

long long unsigned long long 8 0 2 ^ 64-1 1.8×10 ^ 19 18180

unsigned long long uint64
unsigned int unsigned long long

c unsigned long long 299,792,458,000,000,000 ULL
// Speed of light in nanometers per second (approximate).
unsigned long long c = 299792458000000000ULL;

var unsigned long long
unsigned long long var = val;


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