79187444905 has 4 divisors (see below), whose sum is σ = 95024933892. Its totient is φ = 63349955920.

The previous prime is 79187444899. The next prime is 79187444909. The reversal of 79187444905 is 50944478197.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52446038121 + 26741406784 = 229011^2 + 163528^2 .

It is not a de Polignac number, because 79187444905 - 2⁹ = 79187444393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79187444905.

It is not an unprimeable number, because it can be changed into a prime (79187444909) 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, 7918744486 + ... + 7918744495.

It is an arithmetic number, because the mean of its divisors is an integer number (23756233473).

Almost surely, 2^79187444905 is an apocalyptic number.

It is an amenable number.

79187444905 is a deficient number, since it is larger than the sum of its proper divisors (15837488987).

79187444905 is a wasteful number, since it uses less digits than its factorization.

79187444905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15837488986.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 79187444905 in words is "seventy-nine billion, one hundred eighty-seven million, four hundred forty-four thousand, nine hundred five".