Six

6 is an even number.

6 is a palindrome.

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 110.

In hex, 6 is represented as 6.

6 is an Armstrong (or Narcissistic) number, which means it is the sum of its own digits each raised to the power of the number of digits.

6 is the factorial number of 3 (3! = 1 x 2 x 3 = 6).

Prime factorization of 6: 2 * 3.