79308638369 has 2 divisors, whose sum is σ = 79308638370. Its totient is φ = 79308638368.

The previous prime is 79308638333. The next prime is 79308638569. The reversal of 79308638369 is 96383680397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60374878369 + 18933760000 = 245713^2 + 137600^2 .

It is a cyclic number.

It is not a de Polignac number, because 79308638369 - 2⁸ = 79308638113 is a prime.

It is a super-2 number, since 2×79308638369² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79308638569) 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, 39654319184 + 39654319185.

It is an arithmetic number, because the mean of its divisors is an integer number (39654319185).

Almost surely, 2^79308638369 is an apocalyptic number.

It is an amenable number.

79308638369 is a deficient number, since it is larger than the sum of its proper divisors (1).

79308638369 is an equidigital number, since it uses as much as digits as its factorization.

79308638369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35271936, while the sum is 62.

The spelling of 79308638369 in words is "seventy-nine billion, three hundred eight million, six hundred thirty-eight thousand, three hundred sixty-nine".