79965235658857 has 2 divisors, whose sum is σ = 79965235658858. Its totient is φ = 79965235658856.

The previous prime is 79965235658851. The next prime is 79965235658897. The reversal of 79965235658857 is 75885653256997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79939531873881 + 25703784976 = 8940891^2 + 160324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79965235658857 is a prime.

It is not a weakly prime, because it can be changed into another prime (79965235658851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39982617829428 + 39982617829429.

It is an arithmetic number, because the mean of its divisors is an integer number (39982617829429).

Almost surely, 2^{79965235658857} is an apocalyptic number.

It is an amenable number.

79965235658857 is a deficient number, since it is larger than the sum of its proper divisors (1).

79965235658857 is an equidigital number, since it uses as much as digits as its factorization.

79965235658857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34292160000, while the sum is 85.

The spelling of 79965235658857 in words is "seventy-nine trillion, nine hundred sixty-five billion, two hundred thirty-five million, six hundred fifty-eight thousand, eight hundred fifty-seven".