18221154868 has 24 divisors (see below), whose sum is σ = 36446024384. Its totient is φ = 7808270400.

The previous prime is 18221154857. The next prime is 18221154881. The reversal of 18221154868 is 86845112281.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308008 + ... + 362368.

Almost surely, 2^18221154868 is an apocalyptic number.

It is an amenable number.

18221154868 is an abundant number, since it is smaller than the sum of its proper divisors (18224869516).

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

18221154868 is a wasteful number, since it uses less digits than its factorization.

18221154868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66343 (or 66341 counting only the distinct ones).

The product of its digits is 245760, while the sum is 46.

The spelling of 18221154868 in words is "eighteen billion, two hundred twenty-one million, one hundred fifty-four thousand, eight hundred sixty-eight".