18917167868 has 24 divisors (see below), whose sum is σ = 33290995920. Its totient is φ = 9405601920.

The previous prime is 18917167813. The next prime is 18917167879. The reversal of 18917167868 is 86876171981.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18917167868.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506558 + ... + 542618.

It is an arithmetic number, because the mean of its divisors is an integer number (1387124830).

Almost surely, 2^18917167868 is an apocalyptic number.

It is an amenable number.

18917167868 is a deficient number, since it is larger than the sum of its proper divisors (14373828052).

18917167868 is a wasteful number, since it uses less digits than its factorization.

18917167868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36797 (or 36795 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 62.

The spelling of 18917167868 in words is "eighteen billion, nine hundred seventeen million, one hundred sixty-seven thousand, eight hundred sixty-eight".