18331813992 has 16 divisors (see below), whose sum is σ = 45829535040. Its totient is φ = 6110604656.

The previous prime is 18331813987. The next prime is 18331814027. The reversal of 18331813992 is 29931813381.

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, 381912768 + ... + 381912815.

It is an arithmetic number, because the mean of its divisors is an integer number (2864345940).

Almost surely, 2^18331813992 is an apocalyptic number.

18331813992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18331813992 is an abundant number, since it is smaller than the sum of its proper divisors (27497721048).

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

18331813992 is a wasteful number, since it uses less digits than its factorization.

18331813992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763825592 (or 763825588 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The spelling of 18331813992 in words is "eighteen billion, three hundred thirty-one million, eight hundred thirteen thousand, nine hundred ninety-two".