-45 is an odd number.
-45 is a Harshad number, which means it is divisible by the sum of its digits (4 + 5 = 9, and -45 is divisible by 9).
In binary, -45 is represented as 1111111111111111111111111111111111111111111111111111111111010011.
In hex, -45 is represented as ffffffffffffffd3.