18315267173956 has 9 divisors (see below), whose sum is σ = 32051732533149. Its totient is φ = 9157629307344.

The previous prime is 18315267173941. The next prime is 18315267173969. The reversal of 18315267173956 is 65937176251381.

The square root of 18315267173956 is 4279634.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 17640924012100 + 674343161856 = 4200110^2 + 821184^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7489360 + ... + 9629176.

Almost surely, 2^{18315267173956} is an apocalyptic number.

18315267173956 is the 4279634-th square number.

It is an amenable number.

18315267173956 is a deficient number, since it is larger than the sum of its proper divisors (13736465359193).

18315267173956 is an frugal number, since it uses more digits than its factorization.

18315267173956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4279638 (or 2139819 counting only the distinct ones).

The product of its digits is 57153600, while the sum is 64.

The spelling of 18315267173956 in words is "eighteen trillion, three hundred fifteen billion, two hundred sixty-seven million, one hundred seventy-three thousand, nine hundred fifty-six".