18522015816 has 32 divisors (see below), whose sum is σ = 46317873600. Its totient is φ = 6172294080.

The previous prime is 18522015773. The next prime is 18522015913. The reversal of 18522015816 is 61851022581.

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, 17011 + ... + 193218.

It is an arithmetic number, because the mean of its divisors is an integer number (1447433550).

Almost surely, 2^18522015816 is an apocalyptic number.

It is an amenable number.

18522015816 is an abundant number, since it is smaller than the sum of its proper divisors (27795857784).

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

18522015816 is a wasteful number, since it uses less digits than its factorization.

18522015816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213909 (or 213905 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 39.

The spelling of 18522015816 in words is "eighteen billion, five hundred twenty-two million, fifteen thousand, eight hundred sixteen".