31656270661 has 2 divisors, whose sum is σ = 31656270662. Its totient is φ = 31656270660.

The previous prime is 31656270623. The next prime is 31656270703. The reversal of 31656270661 is 16607265613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21809677761 + 9846592900 = 147681^2 + 99230^2 .

It is a cyclic number.

It is not a de Polignac number, because 31656270661 - 2¹⁹ = 31655746373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31656279661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15828135330 + 15828135331.

It is an arithmetic number, because the mean of its divisors is an integer number (15828135331).

Almost surely, 2^31656270661 is an apocalyptic number.

It is an amenable number.

31656270661 is a deficient number, since it is larger than the sum of its proper divisors (1).

31656270661 is an equidigital number, since it uses as much as digits as its factorization.

31656270661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 31656270661 in words is "thirty-one billion, six hundred fifty-six million, two hundred seventy thousand, six hundred sixty-one".