18666824516 has 24 divisors (see below), whose sum is σ = 33800632320. Its totient is φ = 9009639072.

The previous prime is 18666824509. The next prime is 18666824543. The reversal of 18666824516 is 61542866681.

It is a happy number.

It is a super-2 number, since 2×18666824516² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630845 + ... + 659771.

It is an arithmetic number, because the mean of its divisors is an integer number (1408359680).

Almost surely, 2^18666824516 is an apocalyptic number.

It is an amenable number.

18666824516 is a deficient number, since it is larger than the sum of its proper divisors (15133807804).

18666824516 is a wasteful number, since it uses less digits than its factorization.

18666824516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34523 (or 34521 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 53.

The spelling of 18666824516 in words is "eighteen billion, six hundred sixty-six million, eight hundred twenty-four thousand, five hundred sixteen".