-63 is an odd number.
-63 is a Harshad number, which means it is divisible by the sum of its digits (6 + 3 = 9, and -63 is divisible by 9).
In binary, -63 is represented as 1111111111111111111111111111111111111111111111111111111111000001.
In hex, -63 is represented as ffffffffffffffc1.