56606561561 has 4 divisors (see below), whose sum is σ = 61752612624. Its totient is φ = 51460510500.

The previous prime is 56606561533. The next prime is 56606561581. The reversal of 56606561561 is 16516560665.

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 a de Polignac number, because none of the positive numbers 2^k-56606561561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56606561521) 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, 2573025515 + ... + 2573025536.

It is an arithmetic number, because the mean of its divisors is an integer number (15438153156).

Almost surely, 2^56606561561 is an apocalyptic number.

It is an amenable number.

56606561561 is a deficient number, since it is larger than the sum of its proper divisors (5146051063).

56606561561 is a wasteful number, since it uses less digits than its factorization.

56606561561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5146051062.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 56606561561 in words is "fifty-six billion, six hundred six million, five hundred sixty-one thousand, five hundred sixty-one".