79117817173 has 2 divisors, whose sum is σ = 79117817174. Its totient is φ = 79117817172.

The previous prime is 79117817161. The next prime is 79117817183. The reversal of 79117817173 is 37171871197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74913332209 + 4204484964 = 273703^2 + 64842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79117817173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79117817173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79117817113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39558908586 + 39558908587.

It is an arithmetic number, because the mean of its divisors is an integer number (39558908587).

Almost surely, 2^79117817173 is an apocalyptic number.

It is an amenable number.

79117817173 is a deficient number, since it is larger than the sum of its proper divisors (1).

79117817173 is an equidigital number, since it uses as much as digits as its factorization.

79117817173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518616, while the sum is 52.

The spelling of 79117817173 in words is "seventy-nine billion, one hundred seventeen million, eight hundred seventeen thousand, one hundred seventy-three".