56556660013 has 4 divisors (see below), whose sum is σ = 64636182880. Its totient is φ = 48477137148.

The previous prime is 56556660011. The next prime is 56556660049. The reversal of 56556660013 is 31006665565.

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 56556660013 - 2¹ = 56556660011 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 (56556660011) 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, 4039761423 + ... + 4039761436.

It is an arithmetic number, because the mean of its divisors is an integer number (16159045720).

Almost surely, 2^56556660013 is an apocalyptic number.

It is an amenable number.

56556660013 is a deficient number, since it is larger than the sum of its proper divisors (8079522867).

56556660013 is an equidigital number, since it uses as much as digits as its factorization.

56556660013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8079522866.

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 56556660013 in words is "fifty-six billion, five hundred fifty-six million, six hundred sixty thousand, thirteen".