79215257318 has 4 divisors (see below), whose sum is σ = 118822885980. Its totient is φ = 39607628658.

The previous prime is 79215257299. The next prime is 79215257321. The reversal of 79215257318 is 81375251297.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19803814328 + ... + 19803814331.

It is an arithmetic number, because the mean of its divisors is an integer number (29705721495).

Almost surely, 2^79215257318 is an apocalyptic number.

79215257318 is a deficient number, since it is larger than the sum of its proper divisors (39607628662).

79215257318 is a wasteful number, since it uses less digits than its factorization.

79215257318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39607628661.

The product of its digits is 1058400, while the sum is 50.

The spelling of 79215257318 in words is "seventy-nine billion, two hundred fifteen million, two hundred fifty-seven thousand, three hundred eighteen".