56660665651 has 2 divisors, whose sum is σ = 56660665652. Its totient is φ = 56660665650.

The previous prime is 56660665609. The next prime is 56660665667. The reversal of 56660665651 is 15656606665.

56660665651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56660665651 - 2²⁹ = 56123794739 is a prime.

It is a super-2 number, since 2×56660665651² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56660665351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28330332825 + 28330332826.

It is an arithmetic number, because the mean of its divisors is an integer number (28330332826).

Almost surely, 2^56660665651 is an apocalyptic number.

56660665651 is a deficient number, since it is larger than the sum of its proper divisors (1).

56660665651 is an equidigital number, since it uses as much as digits as its factorization.

56660665651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 56660665651 in words is "fifty-six billion, six hundred sixty million, six hundred sixty-five thousand, six hundred fifty-one".