56156561231 has 4 divisors (see below), whose sum is σ = 56337129264. Its totient is φ = 55975993200.

The previous prime is 56156561207. The next prime is 56156561233. The reversal of 56156561231 is 13216565165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13216565165 = 5 ⋅2643313033.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56156561231 is a prime.

It is a super-2 number, since 2×56156561231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56156561233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90283550 + ... + 90284171.

It is an arithmetic number, because the mean of its divisors is an integer number (14084282316).

Almost surely, 2^56156561231 is an apocalyptic number.

56156561231 is a deficient number, since it is larger than the sum of its proper divisors (180568033).

56156561231 is a wasteful number, since it uses less digits than its factorization.

56156561231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180568032.

The product of its digits is 162000, while the sum is 41.

The spelling of 56156561231 in words is "fifty-six billion, one hundred fifty-six million, five hundred sixty-one thousand, two hundred thirty-one".