18217177868 has 18 divisors (see below), whose sum is σ = 32002225164. Its totient is φ = 9073817704.

The previous prime is 18217177831. The next prime is 18217177873. The reversal of 18217177868 is 86877171281.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 243755 + ... + 309597.

It is an arithmetic number, because the mean of its divisors is an integer number (1777901398).

Almost surely, 2^18217177868 is an apocalyptic number.

It is an amenable number.

18217177868 is a deficient number, since it is larger than the sum of its proper divisors (13785047296).

18217177868 is an equidigital number, since it uses as much as digits as its factorization.

18217177868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66373 (or 66108 counting only the distinct ones).

The product of its digits is 2107392, while the sum is 56.

The spelling of 18217177868 in words is "eighteen billion, two hundred seventeen million, one hundred seventy-seven thousand, eight hundred sixty-eight".