31631240666 has 4 divisors (see below), whose sum is σ = 47446861002. Its totient is φ = 15815620332.

The previous prime is 31631240617. The next prime is 31631240699. The reversal of 31631240666 is 66604213613.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26544555625 + 5086685041 = 162925^2 + 71321^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7907810165 + ... + 7907810168.

Almost surely, 2^31631240666 is an apocalyptic number.

31631240666 is a deficient number, since it is larger than the sum of its proper divisors (15815620336).

31631240666 is a wasteful number, since it uses less digits than its factorization.

31631240666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15815620335.

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 31631240666 in words is "thirty-one billion, six hundred thirty-one million, two hundred forty thousand, six hundred sixty-six".