18172520608 has 48 divisors (see below), whose sum is σ = 39043904256. Its totient is φ = 8257213440.

The previous prime is 18172520603. The next prime is 18172520627. The reversal of 18172520608 is 80602527181.

It is not an unprimeable number, because it can be changed into a prime (18172520603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1158385 + ... + 1173967.

It is an arithmetic number, because the mean of its divisors is an integer number (813414672).

Almost surely, 2^18172520608 is an apocalyptic number.

It is an amenable number.

18172520608 is an abundant number, since it is smaller than the sum of its proper divisors (20871383648).

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

18172520608 is a wasteful number, since it uses less digits than its factorization.

18172520608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18917 (or 18909 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 18172520608 in words is "eighteen billion, one hundred seventy-two million, five hundred twenty thousand, six hundred eight".