18355668508 has 24 divisors (see below), whose sum is σ = 32200991648. Its totient is φ = 9155414016.

The previous prime is 18355668503. The next prime is 18355668613. The reversal of 18355668508 is 80586655381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18355668503) 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, 3505060 + ... + 3510292.

Almost surely, 2^18355668508 is an apocalyptic number.

It is an amenable number.

18355668508 is a deficient number, since it is larger than the sum of its proper divisors (13845323140).

18355668508 is a wasteful number, since it uses less digits than its factorization.

18355668508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7213 (or 7211 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 55.

The spelling of 18355668508 in words is "eighteen billion, three hundred fifty-five million, six hundred sixty-eight thousand, five hundred eight".