79909318638 has 40 divisors (see below), whose sum is σ = 180128318832. Its totient is φ = 26476930944.

The previous prime is 79909318637. The next prime is 79909318639. The reversal of 79909318638 is 83681390997.

It is an interprime number because it is at equal distance from previous prime (79909318637) and next prime (79909318639).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79909318637) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1449795 + ... + 1503902.

Almost surely, 2^79909318638 is an apocalyptic number.

79909318638 is an abundant number, since it is smaller than the sum of its proper divisors (100219000194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79909318638 is a wasteful number, since it uses less digits than its factorization.

79909318638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953878 (or 2953869 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 63.

The spelling of 79909318638 in words is "seventy-nine billion, nine hundred nine million, three hundred eighteen thousand, six hundred thirty-eight".