31666516668 has 72 divisors (see below), whose sum is σ = 85093291920. Its totient is φ = 9900921600.

The previous prime is 31666516643. The next prime is 31666516669. The reversal of 31666516668 is 86661566613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31666516669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160105 + ... + 298272.

Almost surely, 2^31666516668 is an apocalyptic number.

31666516668 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

31666516668 is an abundant number, since it is smaller than the sum of its proper divisors (53426775252).

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

31666516668 is a wasteful number, since it uses less digits than its factorization.

31666516668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458507 (or 458502 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

It can be divided in two parts, 316665 and 16668, that added together give a palindrome (333333).

The spelling of 31666516668 in words is "thirty-one billion, six hundred sixty-six million, five hundred sixteen thousand, six hundred sixty-eight".