18391860156 has 24 divisors (see below), whose sum is σ = 42919894864. Its totient is φ = 6129826560.

The previous prime is 18391860119. The next prime is 18391860173. The reversal of 18391860156 is 65106819381.

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, 1476 + ... + 191796.

Almost surely, 2^18391860156 is an apocalyptic number.

It is an amenable number.

18391860156 is an abundant number, since it is smaller than the sum of its proper divisors (24528034708).

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

18391860156 is a wasteful number, since it uses less digits than its factorization.

18391860156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198381 (or 198379 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 18391860156 in words is "eighteen billion, three hundred ninety-one million, eight hundred sixty thousand, one hundred fifty-six".