56156162581 has 4 divisors (see below), whose sum is σ = 56156700064. Its totient is φ = 56155625100.

The previous prime is 56156162549. The next prime is 56156162597. The reversal of 56156162581 is 18526165165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 56156162581 - 2⁵ = 56156162549 is a prime.

It is a super-2 number, since 2×56156162581² (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 (56156162501) 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, 55755 + ... + 339736.

It is an arithmetic number, because the mean of its divisors is an integer number (14039175016).

Almost surely, 2^56156162581 is an apocalyptic number.

It is an amenable number.

56156162581 is a deficient number, since it is larger than the sum of its proper divisors (537483).

56156162581 is a wasteful number, since it uses less digits than its factorization.

56156162581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537482.

The product of its digits is 432000, while the sum is 46.

The spelling of 56156162581 in words is "fifty-six billion, one hundred fifty-six million, one hundred sixty-two thousand, five hundred eighty-one".