31661647272 has 48 divisors (see below), whose sum is σ = 90263472000. Its totient is φ = 9998414496.

The previous prime is 31661647267. The next prime is 31661647301. The reversal of 31661647272 is 27274616613.

31661647272 is a `hidden beast` number, since 3 + 1 + 6 + 616 + 4 + 7 + 27 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11570872 + ... + 11573607.

It is an arithmetic number, because the mean of its divisors is an integer number (1880489000).

Almost surely, 2^31661647272 is an apocalyptic number.

It is an amenable number.

31661647272 is an abundant number, since it is smaller than the sum of its proper divisors (58601824728).

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

31661647272 is a wasteful number, since it uses less digits than its factorization.

31661647272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23144510 (or 23144503 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The spelling of 31661647272 in words is "thirty-one billion, six hundred sixty-one million, six hundred forty-seven thousand, two hundred seventy-two".