18668683356 has 12 divisors (see below), whose sum is σ = 43560261192. Its totient is φ = 6222894448.

The previous prime is 18668683337. The next prime is 18668683367. The reversal of 18668683356 is 65338686681.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 18668683356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777861795 + ... + 777861818.

It is an arithmetic number, because the mean of its divisors is an integer number (3630021766).

Almost surely, 2^18668683356 is an apocalyptic number.

It is an amenable number.

18668683356 is an abundant number, since it is smaller than the sum of its proper divisors (24891577836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18668683356 is a wasteful number, since it uses less digits than its factorization.

18668683356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555723620 (or 1555723618 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 60.

The spelling of 18668683356 in words is "eighteen billion, six hundred sixty-eight million, six hundred eighty-three thousand, three hundred fifty-six".