79519013657 has 2 divisors, whose sum is σ = 79519013658. Its totient is φ = 79519013656.

The previous prime is 79519013653. The next prime is 79519013669. The reversal of 79519013657 is 75631091597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50579560201 + 28939453456 = 224899^2 + 170116^2 .

It is a cyclic number.

It is not a de Polignac number, because 79519013657 - 2² = 79519013653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 79519013599 and 79519013608.

It is not a weakly prime, because it can be changed into another prime (79519013653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39759506828 + 39759506829.

It is an arithmetic number, because the mean of its divisors is an integer number (39759506829).

Almost surely, 2^79519013657 is an apocalyptic number.

It is an amenable number.

79519013657 is a deficient number, since it is larger than the sum of its proper divisors (1).

79519013657 is an equidigital number, since it uses as much as digits as its factorization.

79519013657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1786050, while the sum is 53.

The spelling of 79519013657 in words is "seventy-nine billion, five hundred nineteen million, thirteen thousand, six hundred fifty-seven".