12681368957 has 2 divisors, whose sum is σ = 12681368958. Its totient is φ = 12681368956.

The previous prime is 12681368939. The next prime is 12681368993. The reversal of 12681368957 is 75986318621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12575155321 + 106213636 = 112139^2 + 10306^2 .

It is a cyclic number.

It is not a de Polignac number, because 12681368957 - 2²⁴ = 12664591741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12681368857) by changing a digit.

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, 6340684478 + 6340684479.

It is an arithmetic number, because the mean of its divisors is an integer number (6340684479).

Almost surely, 2^12681368957 is an apocalyptic number.

It is an amenable number.

12681368957 is a deficient number, since it is larger than the sum of its proper divisors (1).

12681368957 is an equidigital number, since it uses as much as digits as its factorization.

12681368957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 56.

The spelling of 12681368957 in words is "twelve billion, six hundred eighty-one million, three hundred sixty-eight thousand, nine hundred fifty-seven".