12681994337 has 2 divisors, whose sum is σ = 12681994338. Its totient is φ = 12681994336.

The previous prime is 12681994333. The next prime is 12681994397. The reversal of 12681994337 is 73349918621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11396843536 + 1285150801 = 106756^2 + 35849^2 .

It is a cyclic number.

It is not a de Polignac number, because 12681994337 - 2² = 12681994333 is a prime.

It is not a weakly prime, because it can be changed into another prime (12681994333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6340997168 + 6340997169.

It is an arithmetic number, because the mean of its divisors is an integer number (6340997169).

Almost surely, 2^12681994337 is an apocalyptic number.

It is an amenable number.

12681994337 is a deficient number, since it is larger than the sum of its proper divisors (1).

12681994337 is an equidigital number, since it uses as much as digits as its factorization.

12681994337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 53.

The spelling of 12681994337 in words is "twelve billion, six hundred eighty-one million, nine hundred ninety-four thousand, three hundred thirty-seven".