79520795657 has 2 divisors, whose sum is σ = 79520795658. Its totient is φ = 79520795656.

The previous prime is 79520795639. The next prime is 79520795689. The reversal of 79520795657 is 75659702597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40786225936 + 38734569721 = 201956^2 + 196811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79520795657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79520795657.

It is not a weakly prime, because it can be changed into another prime (79520095657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39760397828 + 39760397829.

It is an arithmetic number, because the mean of its divisors is an integer number (39760397829).

Almost surely, 2^79520795657 is an apocalyptic number.

It is an amenable number.

79520795657 is a deficient number, since it is larger than the sum of its proper divisors (1).

79520795657 is an equidigital number, since it uses as much as digits as its factorization.

79520795657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41674500, while the sum is 62.

The spelling of 79520795657 in words is "seventy-nine billion, five hundred twenty million, seven hundred ninety-five thousand, six hundred fifty-seven".