18748666784 has 96 divisors (see below), whose sum is σ = 41662252800. Its totient is φ = 8252375040.

The previous prime is 18748666777. The next prime is 18748666787. The reversal of 18748666784 is 48766684781.

It is a self number, because there is not a number n which added to its sum of digits gives 18748666784.

It is not an unprimeable number, because it can be changed into a prime (18748666787) 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, 805064 + ... + 828024.

It is an arithmetic number, because the mean of its divisors is an integer number (433981800).

Almost surely, 2^18748666784 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 18748666784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20831126400).

18748666784 is an abundant number, since it is smaller than the sum of its proper divisors (22913586016).

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

18748666784 is a wasteful number, since it uses less digits than its factorization.

18748666784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23086 (or 23078 counting only the distinct ones).

The product of its digits is 86704128, while the sum is 65.

The spelling of 18748666784 in words is "eighteen billion, seven hundred forty-eight million, six hundred sixty-six thousand, seven hundred eighty-four".