18668336666832 has 60 divisors (see below), whose sum is σ = 52279143525700. Its totient is φ = 6218761526784.

The previous prime is 18668336666831. The next prime is 18668336666839. The reversal of 18668336666832 is 23866663386681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1865092787856 + 16803243878976 = 1365684^2 + 4099176^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18668336666831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41623693 + ... + 42069804.

Almost surely, 2^{18668336666832} is an apocalyptic number.

18668336666832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18668336666832 is an abundant number, since it is smaller than the sum of its proper divisors (33610806858868).

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

18668336666832 is a wasteful number, since it uses less digits than its factorization.

18668336666832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83695060 (or 83695051 counting only the distinct ones).

The product of its digits is 1289945088, while the sum is 72.

The spelling of 18668336666832 in words is "eighteen trillion, six hundred sixty-eight billion, three hundred thirty-six million, six hundred sixty-six thousand, eight hundred thirty-two".