18805207668 has 72 divisors (see below), whose sum is σ = 49872217248. Its totient is φ = 5481663552.

The previous prime is 18805207657. The next prime is 18805207691. The reversal of 18805207668 is 86670250881.

It is a self number, because there is not a number n which added to its sum of digits gives 18805207668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110646 + ... + 223277.

It is an arithmetic number, because the mean of its divisors is an integer number (692669684).

Almost surely, 2^18805207668 is an apocalyptic number.

It is an amenable number.

18805207668 is an abundant number, since it is smaller than the sum of its proper divisors (31067009580).

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

18805207668 is a wasteful number, since it uses less digits than its factorization.

18805207668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333981 (or 333960 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 51.

The spelling of 18805207668 in words is "eighteen billion, eight hundred five million, two hundred seven thousand, six hundred sixty-eight".