79748640218 has 16 divisors (see below), whose sum is σ = 128913448776. Its totient is φ = 36781715520.

The previous prime is 79748640217. The next prime is 79748640221. The reversal of 79748640218 is 81204684797.

It can be written as a sum of positive squares in 4 ways, for example, as 75637650529 + 4110989689 = 275023^2 + 64117^2 .

It is not an unprimeable number, because it can be changed into a prime (79748640217) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1017713 + ... + 1093268.

Almost surely, 2^79748640218 is an apocalyptic number.

79748640218 is a deficient number, since it is larger than the sum of its proper divisors (49164808558).

79748640218 is a wasteful number, since it uses less digits than its factorization.

79748640218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112449.

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 79748640218 in words is "seventy-nine billion, seven hundred forty-eight million, six hundred forty thousand, two hundred eighteen".