18008366856 has 64 divisors (see below), whose sum is σ = 47014542720. Its totient is φ = 5737374720.

The previous prime is 18008366807. The next prime is 18008366867. The reversal of 18008366856 is 65866380081.

It is a junction number, because it is equal to n+sod(n) for n = 18008366799 and 18008366808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 746016 + ... + 769776.

It is an arithmetic number, because the mean of its divisors is an integer number (734602230).

Almost surely, 2^18008366856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18008366856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23507271360).

18008366856 is an abundant number, since it is smaller than the sum of its proper divisors (29006175864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18008366856 is a wasteful number, since it uses less digits than its factorization.

18008366856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25166 (or 25162 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 18008366856 in words is "eighteen billion, eight million, three hundred sixty-six thousand, eight hundred fifty-six".