18557138176 has 18 divisors (see below), whose sum is σ = 37041788042. Its totient is φ = 9278568960.

The previous prime is 18557138161. The next prime is 18557138213. The reversal of 18557138176 is 67183175581.

It can be written as a sum of positive squares in only one way, i.e., 18556978176 + 160000 = 136224^2 + 400^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36244155 + ... + 36244666.

Almost surely, 2^18557138176 is an apocalyptic number.

18557138176 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18557138176 is a deficient number, since it is larger than the sum of its proper divisors (18484649866).

18557138176 is an frugal number, since it uses more digits than its factorization.

18557138176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72488837 (or 72488823 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 52.

The spelling of 18557138176 in words is "eighteen billion, five hundred fifty-seven million, one hundred thirty-eight thousand, one hundred seventy-six".