18685385568 has 36 divisors (see below), whose sum is σ = 53136566028. Its totient is φ = 6228461760.

The previous prime is 18685385549. The next prime is 18685385599. The reversal of 18685385568 is 86558358681.

18685385568 is a `hidden beast` number, since 1 + 8 + 68 + 5 + 3 + 8 + 5 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32439618 + ... + 32440193.

It is an arithmetic number, because the mean of its divisors is an integer number (1476015723).

Almost surely, 2^18685385568 is an apocalyptic number.

18685385568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18685385568 is an abundant number, since it is smaller than the sum of its proper divisors (34451180460).

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

18685385568 is a wasteful number, since it uses less digits than its factorization.

18685385568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64879827 (or 64879816 counting only the distinct ones).

The product of its digits is 55296000, while the sum is 63.

The spelling of 18685385568 in words is "eighteen billion, six hundred eighty-five million, three hundred eighty-five thousand, five hundred sixty-eight".