18 digits: 999999999999999999
19 digits: -8446744073709551617
20 digits: 7766279631452241919
18 digits- -999999999999999999
19 digits- 8446744073709551617
20 digits- -7766279631452241919
Hex base#:
16 digits: 9876543210abcedf
17 digits: 876543210abcedfc
18 digits: 76543210abcedfcc
16 digits: 6789abcdef543121
17 digits: 789abcdef5431204
18 digits: 89abcdef54312034