18131213668056 has 32 divisors (see below), whose sum is σ = 45329319533760. Its totient is φ = 6043566507552.

The previous prime is 18131213668049. The next prime is 18131213668079. The reversal of 18131213668056 is 65086631213181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9845950 + ... + 11541453.

It is an arithmetic number, because the mean of its divisors is an integer number (1416541235430).

Almost surely, 2^{18131213668056} is an apocalyptic number.

It is an amenable number.

18131213668056 is an abundant number, since it is smaller than the sum of its proper divisors (27198105865704).

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

18131213668056 is a wasteful number, since it uses less digits than its factorization.

18131213668056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21422735 (or 21422731 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 18131213668056 in words is "eighteen trillion, one hundred thirty-one billion, two hundred thirteen million, six hundred sixty-eight thousand, fifty-six".