18604385856 has 280 divisors, whose sum is σ = 64320115200. Its totient is φ = 5315030784.

The previous prime is 18604385773. The next prime is 18604385881. The reversal of 18604385856 is 65858340681.

18604385856 is a `hidden beast` number, since 18 + 6 + 0 + 43 + 8 + 585 + 6 = 666.

It is a super-2 number, since 2×18604385856² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 1772881 + ... + 1783343.

Almost surely, 2^18604385856 is an apocalyptic number.

18604385856 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 18604385856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32160057600).

18604385856 is an abundant number, since it is smaller than the sum of its proper divisors (45715729344).

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

18604385856 is an equidigital number, since it uses as much as digits as its factorization.

18604385856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10508 (or 10475 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 54.

The spelling of 18604385856 in words is "eighteen billion, six hundred four million, three hundred eighty-five thousand, eight hundred fifty-six".