18513323568 has 60 divisors (see below), whose sum is σ = 51913589520. Its totient is φ = 6158959488.

The previous prime is 18513323513. The next prime is 18513323579. The reversal of 18513323568 is 86532331581.

18513323568 is a `hidden beast` number, since 1 + 8 + 51 + 3 + 32 + 3 + 568 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52996 + ... + 199587.

It is an arithmetic number, because the mean of its divisors is an integer number (865226492).

Almost surely, 2^18513323568 is an apocalyptic number.

18513323568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18513323568 is an abundant number, since it is smaller than the sum of its proper divisors (33400265952).

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

18513323568 is a wasteful number, since it uses less digits than its factorization.

18513323568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253106 (or 253097 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 18513323568 in words is "eighteen billion, five hundred thirteen million, three hundred twenty-three thousand, five hundred sixty-eight".