618

618 = 2 x 3 x 103.

618 = 0!² + 1!² + 2!² + 3!² + 4!².

618 is 4433 in base 5.

618 is the sum of 10 positive fifth powers (A003355): 618 = 3⁵ + 3⁵ + 2⁵ + 2⁵ + 2⁵ + 2⁵ + 1⁵ + 1⁵ + 1⁵ + 1⁵.

618 is the number of ternary squarefree words of length 15 (A006156).

Source: What's Special About This Number?