188131320165 has 32 divisors (see below), whose sum is σ = 321009575040. Its totient is φ = 93755142144.

The previous prime is 188131320109. The next prime is 188131320173. The reversal of 188131320165 is 561023131881.

It is not a de Polignac number, because 188131320165 - 2²¹ = 188129223013 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2618404 + ... + 2689293.

It is an arithmetic number, because the mean of its divisors is an integer number (10031549220).

Almost surely, 2^188131320165 is an apocalyptic number.

188131320165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

188131320165 is a deficient number, since it is larger than the sum of its proper divisors (132878254875).

188131320165 is a wasteful number, since it uses less digits than its factorization.

188131320165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5307861.

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 188131320165 in words is "one hundred eighty-eight billion, one hundred thirty-one million, three hundred twenty thousand, one hundred sixty-five".