79117918289 has 2 divisors, whose sum is σ = 79117918290. Its totient is φ = 79117918288.

The previous prime is 79117918199. The next prime is 79117918307. The reversal of 79117918289 is 98281971197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61805937664 + 17311980625 = 248608^2 + 131575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79117918289 is a prime.

It is not a weakly prime, because it can be changed into another prime (79117918189) by changing a digit.

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, 39558959144 + 39558959145.

It is an arithmetic number, because the mean of its divisors is an integer number (39558959145).

Almost surely, 2^79117918289 is an apocalyptic number.

It is an amenable number.

79117918289 is a deficient number, since it is larger than the sum of its proper divisors (1).

79117918289 is an equidigital number, since it uses as much as digits as its factorization.

79117918289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 62.

The spelling of 79117918289 in words is "seventy-nine billion, one hundred seventeen million, nine hundred eighteen thousand, two hundred eighty-nine".