18300557172 has 24 divisors (see below), whose sum is σ = 43286251456. Its totient is φ = 6016621248.

The previous prime is 18300557141. The next prime is 18300557189. The reversal of 18300557172 is 27175500381.

It is a self number, because there is not a number n which added to its sum of digits gives 18300557172.

It is a congruent number.

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, 10444648 + ... + 10446399.

Almost surely, 2^18300557172 is an apocalyptic number.

18300557172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18300557172 is an abundant number, since it is smaller than the sum of its proper divisors (24985694284).

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

18300557172 is a wasteful number, since it uses less digits than its factorization.

18300557172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20891127 (or 20891125 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 39.

The spelling of 18300557172 in words is "eighteen billion, three hundred million, five hundred fifty-seven thousand, one hundred seventy-two".