56156605161 has 4 divisors (see below), whose sum is σ = 74875473552. Its totient is φ = 37437736772.

The previous prime is 56156605157. The next prime is 56156605163. The reversal of 56156605161 is 16150665165.

56156605161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 56156605161 - 2² = 56156605157 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56156605163) 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, 9359434191 + ... + 9359434196.

It is an arithmetic number, because the mean of its divisors is an integer number (18718868388).

Almost surely, 2^56156605161 is an apocalyptic number.

It is an amenable number.

56156605161 is a deficient number, since it is larger than the sum of its proper divisors (18718868391).

56156605161 is a wasteful number, since it uses less digits than its factorization.

56156605161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18718868390.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 56156605161 in words is "fifty-six billion, one hundred fifty-six million, six hundred five thousand, one hundred sixty-one".