11656657156 has 27 divisors (see below), whose sum is σ = 20979758709. Its totient is φ = 5666919408.

The previous prime is 11656657141. The next prime is 11656657219. The reversal of 11656657156 is 65175665611.

The square root of 11656657156 is 107966.

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., 10430536900 + 1226120256 = 102130^2 + 35016^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7988755 + ... + 7990213.

Almost surely, 2^11656657156 is an apocalyptic number.

11656657156 is the 107966-th square number.

It is an amenable number.

11656657156 is a deficient number, since it is larger than the sum of its proper divisors (9323101553).

11656657156 is an frugal number, since it uses more digits than its factorization.

11656657156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2996 (or 1498 counting only the distinct ones).

The product of its digits is 1134000, while the sum is 49.

Multiplying 11656657156 by its sum of digits (49), we get a square (571176200644 = 755762²).

The spelling of 11656657156 in words is "eleven billion, six hundred fifty-six million, six hundred fifty-seven thousand, one hundred fifty-six".