56661615653 has 4 divisors (see below), whose sum is σ = 57621982080. Its totient is φ = 55701249228.

The previous prime is 56661615649. The next prime is 56661615667. The reversal of 56661615653 is 35651616665.

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 56661615653 - 2² = 56661615649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56661615623) 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, 480183125 + ... + 480183242.

It is an arithmetic number, because the mean of its divisors is an integer number (14405495520).

Almost surely, 2^56661615653 is an apocalyptic number.

It is an amenable number.

56661615653 is a deficient number, since it is larger than the sum of its proper divisors (960366427).

56661615653 is an equidigital number, since it uses as much as digits as its factorization.

56661615653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960366426.

The product of its digits is 2916000, while the sum is 50.

The spelling of 56661615653 in words is "fifty-six billion, six hundred sixty-one million, six hundred fifteen thousand, six hundred fifty-three".