56611305831 has 4 divisors (see below), whose sum is σ = 75481741112. Its totient is φ = 37740870552.

The previous prime is 56611305811. The next prime is 56611305859. The reversal of 56611305831 is 13850311665.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 56611305831 - 2⁵ = 56611305799 is a prime.

It is a super-2 number, since 2×56611305831² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56611305831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56611305811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9435217636 + ... + 9435217641.

It is an arithmetic number, because the mean of its divisors is an integer number (18870435278).

Almost surely, 2^56611305831 is an apocalyptic number.

56611305831 is a deficient number, since it is larger than the sum of its proper divisors (18870435281).

56611305831 is a wasteful number, since it uses less digits than its factorization.

56611305831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18870435280.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 56611305831 in words is "fifty-six billion, six hundred eleven million, three hundred five thousand, eight hundred thirty-one".