18256506868 has 6 divisors (see below), whose sum is σ = 31948887026. Its totient is φ = 9128253432.

The previous prime is 18256506833. The next prime is 18256506883. The reversal of 18256506868 is 86860565281.

It can be written as a sum of positive squares in only one way, i.e., 16826759524 + 1429747344 = 129718^2 + 37812^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2282063355 + ... + 2282063362.

Almost surely, 2^18256506868 is an apocalyptic number.

It is an amenable number.

18256506868 is a deficient number, since it is larger than the sum of its proper divisors (13692380158).

18256506868 is a wasteful number, since it uses less digits than its factorization.

18256506868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564126721 (or 4564126719 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 55.

The spelling of 18256506868 in words is "eighteen billion, two hundred fifty-six million, five hundred six thousand, eight hundred sixty-eight".