79856965897 has 2 divisors, whose sum is σ = 79856965898. Its totient is φ = 79856965896.

The previous prime is 79856965849. The next prime is 79856965927.

79856965897 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72409966281 + 7446999616 = 269091^2 + 86296^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79856965897 is a prime.

It is a weakly prime.

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, 39928482948 + 39928482949.

It is an arithmetic number, because the mean of its divisors is an integer number (39928482949).

Almost surely, 2^79856965897 is an apocalyptic number.

It is an amenable number.

79856965897 is a deficient number, since it is larger than the sum of its proper divisors (1).

79856965897 is an equidigital number, since it uses as much as digits as its factorization.

79856965897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2057529600, while the sum is 79.

The spelling of 79856965897 in words is "seventy-nine billion, eight hundred fifty-six million, nine hundred sixty-five thousand, eight hundred ninety-seven".