79957649693 has 2 divisors, whose sum is σ = 79957649694. Its totient is φ = 79957649692.

The previous prime is 79957649689. The next prime is 79957649741. The reversal of 79957649693 is 39694675997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77260093849 + 2697555844 = 277957^2 + 51938^2 .

It is a cyclic number.

It is not a de Polignac number, because 79957649693 - 2² = 79957649689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79957649693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79957646693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39978824846 + 39978824847.

It is an arithmetic number, because the mean of its divisors is an integer number (39978824847).

Almost surely, 2^79957649693 is an apocalyptic number.

It is an amenable number.

79957649693 is a deficient number, since it is larger than the sum of its proper divisors (1).

79957649693 is an equidigital number, since it uses as much as digits as its factorization.

79957649693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 694416240, while the sum is 74.

The spelling of 79957649693 in words is "seventy-nine billion, nine hundred fifty-seven million, six hundred forty-nine thousand, six hundred ninety-three".