18873539161 has 27 divisors (see below), whose sum is σ = 20072961279. Its totient is φ = 17745229008.

The previous prime is 18873539149. The next prime is 18873539177. The reversal of 18873539161 is 16193537881.

The square root of 18873539161 is 137381.

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., 16888302025 + 1985237136 = 129955^2 + 44556^2 .

It is not a de Polignac number, because 18873539161 - 2⁵ = 18873539129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18873539099 and 18873539108.

It is not an unprimeable number, because it can be changed into a prime (18873539761) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 238905520 + ... + 238905598.

Almost surely, 2^18873539161 is an apocalyptic number.

18873539161 is the 137381-st square number.

18873539161 is the 68691-st centered octagonal number.

It is an amenable number.

18873539161 is a deficient number, since it is larger than the sum of its proper divisors (1199422118).

18873539161 is an frugal number, since it uses more digits than its factorization.

18873539161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 163 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 52.

The spelling of 18873539161 in words is "eighteen billion, eight hundred seventy-three million, five hundred thirty-nine thousand, one hundred sixty-one".