31661125216 has 48 divisors (see below), whose sum is σ = 71674654464. Its totient is φ = 13485792384.

The previous prime is 31661125183. The next prime is 31661125259. The reversal of 31661125216 is 61252116613.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397060 + ... + 470083.

It is an arithmetic number, because the mean of its divisors is an integer number (1493221968).

Almost surely, 2^31661125216 is an apocalyptic number.

It is an amenable number.

31661125216 is an abundant number, since it is smaller than the sum of its proper divisors (40013529248).

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

31661125216 is a wasteful number, since it uses less digits than its factorization.

31661125216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867323 (or 867315 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The spelling of 31661125216 in words is "thirty-one billion, six hundred sixty-one million, one hundred twenty-five thousand, two hundred sixteen".