18388726568 has 32 divisors (see below), whose sum is σ = 35775586560. Its totient is φ = 8851645440.

The previous prime is 18388726561. The next prime is 18388726627. The reversal of 18388726568 is 86562788381.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a self number, because there is not a number n which added to its sum of digits gives 18388726568.

It is not an unprimeable number, because it can be changed into a prime (18388726561) by changing a digit.

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, 144230 + ... + 239957.

It is an arithmetic number, because the mean of its divisors is an integer number (1117987080).

Almost surely, 2^18388726568 is an apocalyptic number.

It is an amenable number.

18388726568 is a deficient number, since it is larger than the sum of its proper divisors (17386859992).

18388726568 is a wasteful number, since it uses less digits than its factorization.

18388726568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384417 (or 384413 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 62.

The spelling of 18388726568 in words is "eighteen billion, three hundred eighty-eight million, seven hundred twenty-six thousand, five hundred sixty-eight".