18031306608 has 60 divisors (see below), whose sum is σ = 57671563248. Its totient is φ = 5151801600.

The previous prime is 18031306591. The next prime is 18031306613. The reversal of 18031306608 is 80660313081.

18031306608 is a `hidden beast` number, since 18 + 0 + 3 + 1 + 30 + 6 + 608 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8943093 + ... + 8945108.

Almost surely, 2^18031306608 is an apocalyptic number.

18031306608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18031306608 is an abundant number, since it is smaller than the sum of its proper divisors (39640256640).

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

18031306608 is a wasteful number, since it uses less digits than its factorization.

18031306608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17888222 (or 17888213 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

Adding to 18031306608 its reverse (80660313081), we get a palindrome (98691619689).

The spelling of 18031306608 in words is "eighteen billion, thirty-one million, three hundred six thousand, six hundred eight".