79581257744413 has 2 divisors, whose sum is σ = 79581257744414. Its totient is φ = 79581257744412.

The previous prime is 79581257744369. The next prime is 79581257744447. The reversal of 79581257744413 is 31444775218597.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60509153810169 + 19072103934244 = 7778763^2 + 4367162^2 .

It is a cyclic number.

It is not a de Polignac number, because 79581257744413 - 2²⁹ = 79580720873501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79581257744453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39790628872206 + 39790628872207.

It is an arithmetic number, because the mean of its divisors is an integer number (39790628872207).

Almost surely, 2^{79581257744413} is an apocalyptic number.

It is an amenable number.

79581257744413 is a deficient number, since it is larger than the sum of its proper divisors (1).

79581257744413 is an equidigital number, since it uses as much as digits as its factorization.

79581257744413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 237081600, while the sum is 67.

The spelling of 79581257744413 in words is "seventy-nine trillion, five hundred eighty-one billion, two hundred fifty-seven million, seven hundred forty-four thousand, four hundred thirteen".