18531855992 has 32 divisors (see below), whose sum is σ = 39621279600. Its totient is φ = 8050036224.

The previous prime is 18531855971. The next prime is 18531856003. The reversal of 18531855992 is 29955813581.

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, 5239142 + ... + 5242677.

Almost surely, 2^18531855992 is an apocalyptic number.

It is an amenable number.

18531855992 is an abundant number, since it is smaller than the sum of its proper divisors (21089423608).

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

18531855992 is a wasteful number, since it uses less digits than its factorization.

18531855992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10481855 (or 10481851 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 56.

The spelling of 18531855992 in words is "eighteen billion, five hundred thirty-one million, eight hundred fifty-five thousand, nine hundred ninety-two".