79984889855 has 64 divisors (see below), whose sum is σ = 109782422400. Its totient is φ = 55457187840.

The previous prime is 79984889843. The next prime is 79984889863. The reversal of 79984889855 is 55898848997.

It is a Cunningham number, because it is equal to 282816²-1.

It is not a de Polignac number, because 79984889855 - 2¹² = 79984885759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79984889855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78339245 + ... + 78340265.

It is an arithmetic number, because the mean of its divisors is an integer number (1715350350).

Almost surely, 2^79984889855 is an apocalyptic number.

79984889855 is a deficient number, since it is larger than the sum of its proper divisors (29797532545).

79984889855 is a wasteful number, since it uses less digits than its factorization.

79984889855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564.

The product of its digits is 2090188800, while the sum is 80.

The spelling of 79984889855 in words is "seventy-nine billion, nine hundred eighty-four million, eight hundred eighty-nine thousand, eight hundred fifty-five".