12313723666661 has 2 divisors, whose sum is σ = 12313723666662. Its totient is φ = 12313723666660.

The previous prime is 12313723666579. The next prime is 12313723666693. The reversal of 12313723666661 is 16666632731321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9371833209025 + 2941890457636 = 3061345^2 + 1715194^2 .

It is a cyclic number.

It is not a de Polignac number, because 12313723666661 - 2¹⁰ = 12313723665637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12313723666261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156861833330 + 6156861833331.

It is an arithmetic number, because the mean of its divisors is an integer number (6156861833331).

Almost surely, 2^{12313723666661} is an apocalyptic number.

It is an amenable number.

12313723666661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12313723666661 is an equidigital number, since it uses as much as digits as its factorization.

12313723666661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 53.

The spelling of 12313723666661 in words is "twelve trillion, three hundred thirteen billion, seven hundred twenty-three million, six hundred sixty-six thousand, six hundred sixty-one".