-7 is an odd number.
-7 is a Harshad number, which means it is divisible by the sum of its digits (7 = 7, and -7 is divisible by 7).
In binary, -7 is represented as 1111111111111111111111111111111111111111111111111111111111111001.
In hex, -7 is represented as fffffffffffffff9.