17988859857 has 4 divisors (see below), whose sum is σ = 23985146480. Its totient is φ = 11992573236.

The previous prime is 17988859829. The next prime is 17988859883. The reversal of 17988859857 is 75895888971.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 17988859857 - 2⁶ = 17988859793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17988859807) 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, 2998143307 + ... + 2998143312.

It is an arithmetic number, because the mean of its divisors is an integer number (5996286620).

Almost surely, 2^17988859857 is an apocalyptic number.

It is an amenable number.

17988859857 is a deficient number, since it is larger than the sum of its proper divisors (5996286623).

17988859857 is an equidigital number, since it uses as much as digits as its factorization.

17988859857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996286622.

The product of its digits is 406425600, while the sum is 75.

The spelling of 17988859857 in words is "seventeen billion, nine hundred eighty-eight million, eight hundred fifty-nine thousand, eight hundred fifty-seven".