56216020691 has 2 divisors, whose sum is σ = 56216020692. Its totient is φ = 56216020690.

The previous prime is 56216020687. The next prime is 56216020723. The reversal of 56216020691 is 19602061265.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56216020691 - 2² = 56216020687 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (56216020591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28108010345 + 28108010346.

It is an arithmetic number, because the mean of its divisors is an integer number (28108010346).

Almost surely, 2^56216020691 is an apocalyptic number.

56216020691 is a deficient number, since it is larger than the sum of its proper divisors (1).

56216020691 is an equidigital number, since it uses as much as digits as its factorization.

56216020691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 56216020691 in words is "fifty-six billion, two hundred sixteen million, twenty thousand, six hundred ninety-one".