56684005691 has 2 divisors, whose sum is σ = 56684005692. Its totient is φ = 56684005690.

The previous prime is 56684005639. The next prime is 56684005727. The reversal of 56684005691 is 19650048665.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56684005691 is a prime.

It is not a weakly prime, because it can be changed into another prime (56684005621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28342002845 + 28342002846.

It is an arithmetic number, because the mean of its divisors is an integer number (28342002846).

Almost surely, 2^56684005691 is an apocalyptic number.

56684005691 is a deficient number, since it is larger than the sum of its proper divisors (1).

56684005691 is an equidigital number, since it uses as much as digits as its factorization.

56684005691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 56684005691 in words is "fifty-six billion, six hundred eighty-four million, five thousand, six hundred ninety-one".