-6 is an even number.
-6 is a Harshad number, which means it is divisible by the sum of its digits (6 = 6, and -6 is divisible by 6).
In binary, -6 is represented as 1111111111111111111111111111111111111111111111111111111111111010.
In hex, -6 is represented as fffffffffffffffa.