56616356161 has 4 divisors (see below), whose sum is σ = 59596164400. Its totient is φ = 53636547924.

The previous prime is 56616356143. The next prime is 56616356171. The reversal of 56616356161 is 16165361665.

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 an emirpimes, since its reverse is a distinct semiprime: 16165361665 = 5 ⋅3233072333.

It is a cyclic number.

It is not a de Polignac number, because 56616356161 - 2⁵ = 56616356129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56616356101) 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, 1489904091 + ... + 1489904128.

It is an arithmetic number, because the mean of its divisors is an integer number (14899041100).

Almost surely, 2^56616356161 is an apocalyptic number.

It is an amenable number.

56616356161 is a deficient number, since it is larger than the sum of its proper divisors (2979808239).

56616356161 is a wasteful number, since it uses less digits than its factorization.

56616356161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2979808238.

The product of its digits is 583200, while the sum is 46.

The spelling of 56616356161 in words is "fifty-six billion, six hundred sixteen million, three hundred fifty-six thousand, one hundred sixty-one".