138931166161 has 8 divisors (see below), whose sum is σ = 141560892648. Its totient is φ = 136312800000.

The previous prime is 138931166149. The next prime is 138931166183. The reversal of 138931166161 is 161661139831.

It can be written as a sum of positive squares in 4 ways, for example, as 9992001600 + 128939164561 = 99960^2 + 359081^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138931166161 - 2³³ = 130341231569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138931166131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2815390 + ... + 2864311.

It is an arithmetic number, because the mean of its divisors is an integer number (17695111581).

Almost surely, 2^138931166161 is an apocalyptic number.

It is an amenable number.

138931166161 is a deficient number, since it is larger than the sum of its proper divisors (2629726487).

138931166161 is an equidigital number, since it uses as much as digits as its factorization.

138931166161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680163.

The product of its digits is 139968, while the sum is 46.

The spelling of 138931166161 in words is "one hundred thirty-eight billion, nine hundred thirty-one million, one hundred sixty-six thousand, one hundred sixty-one".