12461908661 has 2 divisors, whose sum is σ = 12461908662. Its totient is φ = 12461908660.

The previous prime is 12461908637. The next prime is 12461908663. The reversal of 12461908661 is 16680916421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6660192100 + 5801716561 = 81610^2 + 76169^2 .

It is a cyclic number.

It is not a de Polignac number, because 12461908661 - 2¹⁸ = 12461646517 is a prime.

It is a Sophie Germain prime.

Together with 12461908663, it forms a pair of twin primes.

It is a Chen 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 (12461908663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6230954330 + 6230954331.

It is an arithmetic number, because the mean of its divisors is an integer number (6230954331).

Almost surely, 2^12461908661 is an apocalyptic number.

It is an amenable number.

12461908661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12461908661 is an equidigital number, since it uses as much as digits as its factorization.

12461908661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 12461908661 in words is "twelve billion, four hundred sixty-one million, nine hundred eight thousand, six hundred sixty-one".