18901592172 has 36 divisors (see below), whose sum is σ = 48492150616. Its totient is φ = 6206492160.

The previous prime is 18901592161. The next prime is 18901592197. The reversal of 18901592172 is 27129510981.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×18901592172² (a number of 21 digits) contains 22 as substring.

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, 3915829 + ... + 3920652.

Almost surely, 2^18901592172 is an apocalyptic number.

18901592172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18901592172 is an abundant number, since it is smaller than the sum of its proper divisors (29590558444).

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

18901592172 is a wasteful number, since it uses less digits than its factorization.

18901592172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7836558 (or 7836553 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 45.

The spelling of 18901592172 in words is "eighteen billion, nine hundred one million, five hundred ninety-two thousand, one hundred seventy-two".