79026636617 has 2 divisors, whose sum is σ = 79026636618. Its totient is φ = 79026636616.

The previous prime is 79026636569. The next prime is 79026636659. The reversal of 79026636617 is 71663662097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42105398416 + 36921238201 = 205196^2 + 192149^2 .

It is an emirp because it is prime and its reverse (71663662097) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79026636617 - 2⁸ = 79026636361 is a prime.

It is not a weakly prime, because it can be changed into another prime (79026636677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39513318308 + 39513318309.

It is an arithmetic number, because the mean of its divisors is an integer number (39513318309).

Almost surely, 2^79026636617 is an apocalyptic number.

It is an amenable number.

79026636617 is a deficient number, since it is larger than the sum of its proper divisors (1).

79026636617 is an equidigital number, since it uses as much as digits as its factorization.

79026636617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3429216, while the sum is 53.

The spelling of 79026636617 in words is "seventy-nine billion, twenty-six million, six hundred thirty-six thousand, six hundred seventeen".