79909318639 has 2 divisors, whose sum is σ = 79909318640. Its totient is φ = 79909318638.

The previous prime is 79909318637. The next prime is 79909318649. The reversal of 79909318639 is 93681390997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79909318639 - 2¹ = 79909318637 is a prime.

Together with 79909318637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79909318637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39954659319 + 39954659320.

It is an arithmetic number, because the mean of its divisors is an integer number (39954659320).

Almost surely, 2^79909318639 is an apocalyptic number.

79909318639 is a deficient number, since it is larger than the sum of its proper divisors (1).

79909318639 is an equidigital number, since it uses as much as digits as its factorization.

79909318639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19840464, while the sum is 64.

The spelling of 79909318639 in words is "seventy-nine billion, nine hundred nine million, three hundred eighteen thousand, six hundred thirty-nine".