18181481368 has 32 divisors (see below), whose sum is σ = 37995361200. Its totient is φ = 8105674752.

The previous prime is 18181481341. The next prime is 18181481377. The reversal of 18181481368 is 86318418181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3515505 + ... + 3520672.

Almost surely, 2^18181481368 is an apocalyptic number.

It is an amenable number.

18181481368 is an abundant number, since it is smaller than the sum of its proper divisors (19813879832).

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

18181481368 is a wasteful number, since it uses less digits than its factorization.

18181481368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7036219 (or 7036215 counting only the distinct ones).

The product of its digits is 294912, while the sum is 49.

The spelling of 18181481368 in words is "eighteen billion, one hundred eighty-one million, four hundred eighty-one thousand, three hundred sixty-eight".