18628663999 has 8 divisors (see below), whose sum is σ = 21205752192. Its totient is φ = 16198838040.

The previous prime is 18628663997. The next prime is 18628664003. The reversal of 18628663999 is 99936682681.

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

It is not a de Polignac number, because 18628663999 - 2¹ = 18628663997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18628663993) 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, 36815289 + ... + 36815794.

It is an arithmetic number, because the mean of its divisors is an integer number (2650719024).

Almost surely, 2^18628663999 is an apocalyptic number.

18628663999 is a deficient number, since it is larger than the sum of its proper divisors (2577088193).

18628663999 is a wasteful number, since it uses less digits than its factorization.

18628663999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73631117.

The product of its digits is 60466176, while the sum is 67.

The spelling of 18628663999 in words is "eighteen billion, six hundred twenty-eight million, six hundred sixty-three thousand, nine hundred ninety-nine".