79666015913879 has 4 divisors (see below), whose sum is σ = 79667787771576. Its totient is φ = 79664244056184.

The previous prime is 79666015913839. The next prime is 79666015913881. The reversal of 79666015913879 is 97831951066697.

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

It is a cyclic number.

It is not a de Polignac number, because 79666015913879 - 2¹² = 79666015909783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79666015913819) 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, 885861404 + ... + 885951329.

It is an arithmetic number, because the mean of its divisors is an integer number (19916946942894).

Almost surely, 2^{79666015913879} is an apocalyptic number.

79666015913879 is a deficient number, since it is larger than the sum of its proper divisors (1771857697).

79666015913879 is a wasteful number, since it uses less digits than its factorization.

79666015913879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771857696.

The product of its (nonzero) digits is 925888320, while the sum is 77.

The spelling of 79666015913879 in words is "seventy-nine trillion, six hundred sixty-six billion, fifteen million, nine hundred thirteen thousand, eight hundred seventy-nine".