18388343868 has 24 divisors (see below), whose sum is σ = 45164353920. Its totient is φ = 5806845360.

The previous prime is 18388343863. The next prime is 18388343881. The reversal of 18388343868 is 86834388381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18388343861) 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, 40325088 + ... + 40325543.

It is an arithmetic number, because the mean of its divisors is an integer number (1881848080).

Almost surely, 2^18388343868 is an apocalyptic number.

It is an amenable number.

18388343868 is an abundant number, since it is smaller than the sum of its proper divisors (26776010052).

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

18388343868 is a wasteful number, since it uses less digits than its factorization.

18388343868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80650657 (or 80650655 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 60.

The spelling of 18388343868 in words is "eighteen billion, three hundred eighty-eight million, three hundred forty-three thousand, eight hundred sixty-eight".