156756392138 has 4 divisors (see below), whose sum is σ = 235134588210. Its totient is φ = 78378196068.

The previous prime is 156756392129. The next prime is 156756392161. The reversal of 156756392138 is 831293657651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831293657651 = 10357 ⋅80263943.

It can be written as a sum of positive squares in only one way, i.e., 125644018369 + 31112373769 = 354463^2 + 176387^2 .

It is a super-2 number, since 2×156756392138² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39189098033 + ... + 39189098036.

Almost surely, 2^156756392138 is an apocalyptic number.

156756392138 is a deficient number, since it is larger than the sum of its proper divisors (78378196072).

156756392138 is an equidigital number, since it uses as much as digits as its factorization.

156756392138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78378196071.

The product of its digits is 8164800, while the sum is 56.

The spelling of 156756392138 in words is "one hundred fifty-six billion, seven hundred fifty-six million, three hundred ninety-two thousand, one hundred thirty-eight".