31661516168 has 16 divisors (see below), whose sum is σ = 59434145280. Its totient is φ = 15812410768.

The previous prime is 31661516143. The next prime is 31661516171. The reversal of 31661516168 is 86161516613.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2286080 + ... + 2299887.

It is an arithmetic number, because the mean of its divisors is an integer number (3714634080).

Almost surely, 2^31661516168 is an apocalyptic number.

It is an amenable number.

31661516168 is a deficient number, since it is larger than the sum of its proper divisors (27772629112).

31661516168 is a wasteful number, since it uses less digits than its factorization.

31661516168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4586836 (or 4586832 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The spelling of 31661516168 in words is "thirty-one billion, six hundred sixty-one million, five hundred sixteen thousand, one hundred sixty-eight".