12681368993 has 2 divisors, whose sum is σ = 12681368994. Its totient is φ = 12681368992.

The previous prime is 12681368957. The next prime is 12681369017. The reversal of 12681368993 is 39986318621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10580796769 + 2100572224 = 102863^2 + 45832^2 .

It is a cyclic number.

It is not a de Polignac number, because 12681368993 - 2⁸ = 12681368737 is a prime.

It is not a weakly prime, because it can be changed into another prime (12681068993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6340684496 + 6340684497.

It is an arithmetic number, because the mean of its divisors is an integer number (6340684497).

Almost surely, 2^12681368993 is an apocalyptic number.

It is an amenable number.

12681368993 is a deficient number, since it is larger than the sum of its proper divisors (1).

12681368993 is an equidigital number, since it uses as much as digits as its factorization.

12681368993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 56.

The spelling of 12681368993 in words is "twelve billion, six hundred eighty-one million, three hundred sixty-eight thousand, nine hundred ninety-three".