18613811808 has 72 divisors (see below), whose sum is σ = 52949824200. Its totient is φ = 6202635264.

The previous prime is 18613811753. The next prime is 18613811813. The reversal of 18613811808 is 80811831681.

18613811808 is a `hidden beast` number, since 18 + 613 + 8 + 1 + 18 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1111723 + ... + 1128341.

It is an arithmetic number, because the mean of its divisors is an integer number (735414225).

Almost surely, 2^18613811808 is an apocalyptic number.

18613811808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18613811808 is an abundant number, since it is smaller than the sum of its proper divisors (34336012392).

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

18613811808 is a wasteful number, since it uses less digits than its factorization.

18613811808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20524 (or 20513 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 45.

The spelling of 18613811808 in words is "eighteen billion, six hundred thirteen million, eight hundred eleven thousand, eight hundred eight".