18905315568 has 80 divisors (see below), whose sum is σ = 49521830400. Its totient is φ = 6213841920.

The previous prime is 18905315531. The next prime is 18905315599. The reversal of 18905315568 is 86551350981.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18905315568.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3337923 + ... + 3343581.

It is an arithmetic number, because the mean of its divisors is an integer number (619022880).

Almost surely, 2^18905315568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18905315568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24760915200).

18905315568 is an abundant number, since it is smaller than the sum of its proper divisors (30616514832).

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

18905315568 is a wasteful number, since it uses less digits than its factorization.

18905315568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6630 (or 6624 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 51.

The spelling of 18905315568 in words is "eighteen billion, nine hundred five million, three hundred fifteen thousand, five hundred sixty-eight".