17979889673 has 16 divisors (see below), whose sum is σ = 19135996560. Its totient is φ = 16834922496.

The previous prime is 17979889661. The next prime is 17979889699. The reversal of 17979889673 is 37698897971.

It can be written as a sum of positive squares in 8 ways, for example, as 5920994704 + 12058894969 = 76948^2 + 109813^2 .

It is a cyclic number.

It is not a de Polignac number, because 17979889673 - 2¹⁸ = 17979627529 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 17979889673.

It is not an unprimeable number, because it can be changed into a prime (17979889073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3449093 + ... + 3454301.

It is an arithmetic number, because the mean of its divisors is an integer number (1195999785).

Almost surely, 2^17979889673 is an apocalyptic number.

It is an amenable number.

17979889673 is a deficient number, since it is larger than the sum of its proper divisors (1156106887).

17979889673 is a wasteful number, since it uses less digits than its factorization.

17979889673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6236.

The product of its digits is 288054144, while the sum is 74.

The spelling of 17979889673 in words is "seventeen billion, nine hundred seventy-nine million, eight hundred eighty-nine thousand, six hundred seventy-three".