31631622066 has 128 divisors (see below), whose sum is σ = 81077760000. Its totient is φ = 9040455360.

The previous prime is 31631622049. The next prime is 31631622073. The reversal of 31631622066 is 66022613613.

31631622066 is a `hidden beast` number, since 316 + 316 + 2 + 20 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 31631622066.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2578375 + ... + 2590613.

It is an arithmetic number, because the mean of its divisors is an integer number (633420000).

Almost surely, 2^31631622066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31631622066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40538880000).

31631622066 is an abundant number, since it is smaller than the sum of its proper divisors (49446137934).

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

31631622066 is a wasteful number, since it uses less digits than its factorization.

31631622066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12509 (or 12503 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The spelling of 31631622066 in words is "thirty-one billion, six hundred thirty-one million, six hundred twenty-two thousand, sixty-six".