18636634808 has 32 divisors (see below), whose sum is σ = 39350085120. Its totient is φ = 8197932000.

The previous prime is 18636634789. The next prime is 18636634811. The reversal of 18636634808 is 80843663681.

It is a self number, because there is not a number n which added to its sum of digits gives 18636634808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3413078 + ... + 3418533.

It is an arithmetic number, because the mean of its divisors is an integer number (1229690160).

Almost surely, 2^18636634808 is an apocalyptic number.

It is an amenable number.

18636634808 is an abundant number, since it is smaller than the sum of its proper divisors (20713450312).

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

18636634808 is a wasteful number, since it uses less digits than its factorization.

18636634808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6831659 (or 6831655 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 18636634808 in words is "eighteen billion, six hundred thirty-six million, six hundred thirty-four thousand, eight hundred eight".