31572006661 has 8 divisors (see below), whose sum is σ = 34003259864. Its totient is φ = 29141130240.

The previous prime is 31572006623. The next prime is 31572006673. The reversal of 31572006661 is 16660027513.

It can be written as a sum of positive squares in 4 ways, for example, as 5377761 + 31566628900 = 2319^2 + 177670^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31572006661 - 2²¹ = 31569909509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31572006661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31572006061) by changing a digit.

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, 93745 + ... + 268201.

It is an arithmetic number, because the mean of its divisors is an integer number (4250407483).

Almost surely, 2^31572006661 is an apocalyptic number.

It is an amenable number.

31572006661 is a deficient number, since it is larger than the sum of its proper divisors (2431253203).

31572006661 is a wasteful number, since it uses less digits than its factorization.

31572006661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188391.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 31572006661 in words is "thirty-one billion, five hundred seventy-two million, six thousand, six hundred sixty-one".