18666824541 has 8 divisors (see below), whose sum is σ = 25971234240. Its totient is φ = 11903482272.

The previous prime is 18666824509. The next prime is 18666824543. The reversal of 18666824541 is 14542866681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18666824541 - 2⁵ = 18666824509 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18666824543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135266776 + ... + 135266913.

It is an arithmetic number, because the mean of its divisors is an integer number (3246404280).

Almost surely, 2^18666824541 is an apocalyptic number.

It is an amenable number.

18666824541 is a deficient number, since it is larger than the sum of its proper divisors (7304409699).

18666824541 is a wasteful number, since it uses less digits than its factorization.

18666824541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270533715.

The product of its digits is 2211840, while the sum is 51.

The spelling of 18666824541 in words is "eighteen billion, six hundred sixty-six million, eight hundred twenty-four thousand, five hundred forty-one".