79909318665 has 64 divisors (see below), whose sum is σ = 155059660800. Its totient is φ = 38722910400.

The previous prime is 79909318661. The next prime is 79909318679. The reversal of 79909318665 is 56681390997.

It is not a de Polignac number, because 79909318665 - 2² = 79909318661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79909318661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2925220 + ... + 2952410.

It is an arithmetic number, because the mean of its divisors is an integer number (2422807200).

Almost surely, 2^79909318665 is an apocalyptic number.

It is an amenable number.

79909318665 is a deficient number, since it is larger than the sum of its proper divisors (75150342135).

79909318665 is a wasteful number, since it uses less digits than its factorization.

79909318665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29195 (or 29189 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 63.

The spelling of 79909318665 in words is "seventy-nine billion, nine hundred nine million, three hundred eighteen thousand, six hundred sixty-five".