17978320317 has 8 divisors (see below), whose sum is σ = 24003533920. Its totient is φ = 11969326800.

The previous prime is 17978320307. The next prime is 17978320333. The reversal of 17978320317 is 71302387971.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 17978320317 - 2⁷ = 17978320189 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 (17978320307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4052434 + ... + 4056867.

It is an arithmetic number, because the mean of its divisors is an integer number (3000441740).

Almost surely, 2^17978320317 is an apocalyptic number.

It is an amenable number.

17978320317 is a deficient number, since it is larger than the sum of its proper divisors (6025213603).

17978320317 is an equidigital number, since it uses as much as digits as its factorization.

17978320317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8110043.

The product of its (nonzero) digits is 444528, while the sum is 48.

The spelling of 17978320317 in words is "seventeen billion, nine hundred seventy-eight million, three hundred twenty thousand, three hundred seventeen".