79909318641 has 4 divisors (see below), whose sum is σ = 106545758192. Its totient is φ = 53272879092.

The previous prime is 79909318639. The next prime is 79909318649. The reversal of 79909318641 is 14681390997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 79909318641 - 2¹ = 79909318639 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79909318649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13318219771 + ... + 13318219776.

It is an arithmetic number, because the mean of its divisors is an integer number (26636439548).

Almost surely, 2^79909318641 is an apocalyptic number.

It is an amenable number.

79909318641 is a deficient number, since it is larger than the sum of its proper divisors (26636439551).

79909318641 is a wasteful number, since it uses less digits than its factorization.

79909318641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26636439550.

The product of its (nonzero) digits is 2939328, while the sum is 57.

The spelling of 79909318641 in words is "seventy-nine billion, nine hundred nine million, three hundred eighteen thousand, six hundred forty-one".