18904985856 has 432 divisors, whose sum is σ = 59193912960. Its totient is φ = 5790597120.

The previous prime is 18904985849. The next prime is 18904985867. The reversal of 18904985856 is 65858940981.

18904985856 is a `hidden beast` number, since 1 + 8 + 9 + 0 + 49 + 8 + 585 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18904985793 and 18904985802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 183543501 + ... + 183543603.

Almost surely, 2^18904985856 is an apocalyptic number.

18904985856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18904985856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29596956480).

18904985856 is an abundant number, since it is smaller than the sum of its proper divisors (40288927104).

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

18904985856 is a wasteful number, since it uses less digits than its factorization.

18904985856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 24883200, while the sum is 63.

The spelling of 18904985856 in words is "eighteen billion, nine hundred four million, nine hundred eighty-five thousand, eight hundred fifty-six".