31681718168 has 32 divisors (see below), whose sum is σ = 60172223760. Its totient is φ = 15636848640.

The previous prime is 31681718141. The next prime is 31681718171. The reversal of 31681718168 is 86181718613.

It is a happy number.

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, 174680 + ... + 306392.

Almost surely, 2^31681718168 is an apocalyptic number.

It is an amenable number.

31681718168 is a deficient number, since it is larger than the sum of its proper divisors (28490505592).

31681718168 is a wasteful number, since it uses less digits than its factorization.

31681718168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132107 (or 132103 counting only the distinct ones).

The product of its digits is 387072, while the sum is 50.

The spelling of 31681718168 in words is "thirty-one billion, six hundred eighty-one million, seven hundred eighteen thousand, one hundred sixty-eight".