18821864918 has 16 divisors (see below), whose sum is σ = 28625106240. Its totient is φ = 9280213056.

The previous prime is 18821864879. The next prime is 18821864933. The reversal of 18821864918 is 81946812881.

It is a congruent number.

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, 1049168 + ... + 1066956.

It is an arithmetic number, because the mean of its divisors is an integer number (1789069140).

Almost surely, 2^18821864918 is an apocalyptic number.

18821864918 is a deficient number, since it is larger than the sum of its proper divisors (9803241322).

18821864918 is a wasteful number, since it uses less digits than its factorization.

18821864918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25111.

The product of its digits is 1769472, while the sum is 56.

The spelling of 18821864918 in words is "eighteen billion, eight hundred twenty-one million, eight hundred sixty-four thousand, nine hundred eighteen".