18019633868 has 12 divisors (see below), whose sum is σ = 31535700672. Its totient is φ = 9009433680.

The previous prime is 18019633861. The next prime is 18019633897. The reversal of 18019633868 is 86833691081.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18019633861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27653 + ... + 191843.

It is an arithmetic number, because the mean of its divisors is an integer number (2627975056).

Almost surely, 2^18019633868 is an apocalyptic number.

It is an amenable number.

18019633868 is a deficient number, since it is larger than the sum of its proper divisors (13516066804).

18019633868 is a wasteful number, since it uses less digits than its factorization.

18019633868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191632 (or 191630 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 53.

The spelling of 18019633868 in words is "eighteen billion, nineteen million, six hundred thirty-three thousand, eight hundred sixty-eight".