18187031968 has 48 divisors (see below), whose sum is σ = 40963454784. Its totient is φ = 7786321920.

The previous prime is 18187031939. The next prime is 18187031999. The reversal of 18187031968 is 86913078181.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175696 + ... + 259312.

It is an arithmetic number, because the mean of its divisors is an integer number (853405308).

Almost surely, 2^18187031968 is an apocalyptic number.

It is an amenable number.

18187031968 is an abundant number, since it is smaller than the sum of its proper divisors (22776422816).

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

18187031968 is an equidigital number, since it uses as much as digits as its factorization.

18187031968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84605 (or 84597 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 52.

The spelling of 18187031968 in words is "eighteen billion, one hundred eighty-seven million, thirty-one thousand, nine hundred sixty-eight".