18665794544688 has 120 divisors (see below), whose sum is σ = 52831939923360. Its totient is φ = 6151242746880.

The previous prime is 18665794544671. The next prime is 18665794544689. The reversal of 18665794544688 is 88644549756681.

18665794544688 is a `hidden beast` number, since 1 + 8 + 6 + 6 + 5 + 7 + 9 + 4 + 544 + 68 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (18665794544689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105810478 + ... + 105986738.

It is an arithmetic number, because the mean of its divisors is an integer number (440266166028).

Almost surely, 2^{18665794544688} is an apocalyptic number.

18665794544688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18665794544688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26415969961680).

18665794544688 is an abundant number, since it is smaller than the sum of its proper divisors (34166145378672).

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

18665794544688 is a wasteful number, since it uses less digits than its factorization.

18665794544688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184627 (or 184618 counting only the distinct ones).

The product of its digits is 11147673600, while the sum is 81.

The spelling of 18665794544688 in words is "eighteen trillion, six hundred sixty-five billion, seven hundred ninety-four million, five hundred forty-four thousand, six hundred eighty-eight".