-171 is an odd number.
-171 is a Harshad number, which means it is divisible by the sum of its digits (1 + 7 + 1 = 9, and -171 is divisible by 9).
In binary, -171 is represented as 1111111111111111111111111111111111111111111111111111111101010101.
In hex, -171 is represented as ffffffffffffff55.