55616560561 has 4 divisors (see below), whose sum is σ = 55624661824. Its totient is φ = 55608459300.

The previous prime is 55616560553. The next prime is 55616560577. The reversal of 55616560561 is 16506561655.

55616560561 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 55616560561 - 2³ = 55616560553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55616560501) 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, 4040325 + ... + 4054066.

It is an arithmetic number, because the mean of its divisors is an integer number (13906165456).

Almost surely, 2^55616560561 is an apocalyptic number.

It is an amenable number.

55616560561 is a deficient number, since it is larger than the sum of its proper divisors (8101263).

55616560561 is an equidigital number, since it uses as much as digits as its factorization.

55616560561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8101262.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 55616560561 in words is "fifty-five billion, six hundred sixteen million, five hundred sixty thousand, five hundred sixty-one".