56510111161 has 4 divisors (see below), whose sum is σ = 64582984192. Its totient is φ = 48437238132.

The previous prime is 56510111153. The next prime is 56510111171. The reversal of 56510111161 is 16111101565.

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.

It is a cyclic number.

It is not a de Polignac number, because 56510111161 - 2³ = 56510111153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56510111171) 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, 4036436505 + ... + 4036436518.

It is an arithmetic number, because the mean of its divisors is an integer number (16145746048).

Almost surely, 2^56510111161 is an apocalyptic number.

It is an amenable number.

56510111161 is a deficient number, since it is larger than the sum of its proper divisors (8072873031).

56510111161 is an equidigital number, since it uses as much as digits as its factorization.

56510111161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8072873030.

The product of its (nonzero) digits is 900, while the sum is 28.

The spelling of 56510111161 in words is "fifty-six billion, five hundred ten million, one hundred eleven thousand, one hundred sixty-one".