18985560408 has 64 divisors (see below), whose sum is σ = 53230608000. Its totient is φ = 6269367456.

The previous prime is 18985560401. The next prime is 18985560431. The reversal of 18985560408 is 80406558981.

It is a happy number.

18985560408 is a `hidden beast` number, since 1 + 89 + 8 + 556 + 0 + 4 + 0 + 8 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18985560401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 387618 + ... + 433841.

It is an arithmetic number, because the mean of its divisors is an integer number (831728250).

Almost surely, 2^18985560408 is an apocalyptic number.

18985560408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18985560408 is an abundant number, since it is smaller than the sum of its proper divisors (34245047592).

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

18985560408 is a wasteful number, since it uses less digits than its factorization.

18985560408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821581 (or 821571 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 54.

The spelling of 18985560408 in words is "eighteen billion, nine hundred eighty-five million, five hundred sixty thousand, four hundred eight".