156856394601 has 27 divisors (see below), whose sum is σ = 229098535653. Its totient is φ = 103416837120.

The previous prime is 156856394593. The next prime is 156856394621. The reversal of 156856394601 is 106493658651.

The square root of 156856394601 is 396051.

It is a perfect power (a square), and thus also a powerful number.

156856394601 is a `hidden beast` number, since 1 + 568 + 5 + 6 + 39 + 46 + 0 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 25104818025 + 131751576576 = 158445^2 + 362976^2 .

It is not a de Polignac number, because 156856394601 - 2³ = 156856394593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156856394621) 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, 115250161 + ... + 115251521.

Almost surely, 2^156856394601 is an apocalyptic number.

156856394601 is the 396051-st square number.

156856394601 is the 198026-th centered octagonal number.

It is an amenable number.

156856394601 is a deficient number, since it is larger than the sum of its proper divisors (72242141052).

156856394601 is an frugal number, since it uses more digits than its factorization.

156856394601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922 (or 1461 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 156856394601 in words is "one hundred fifty-six billion, eight hundred fifty-six million, three hundred ninety-four thousand, six hundred one".