-216 is an even number.
-216 is a Harshad number, which means it is divisible by the sum of its digits (2 + 1 + 6 = 9, and -216 is divisible by 9).
In binary, -216 is represented as 1111111111111111111111111111111111111111111111111111111100101000.
In hex, -216 is represented as ffffffffffffff28.