12688478449 has 2 divisors, whose sum is σ = 12688478450. Its totient is φ = 12688478448.

The previous prime is 12688478441. The next prime is 12688478461. The reversal of 12688478449 is 94487488621.

12688478449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11822647824 + 865830625 = 108732^2 + 29425^2 .

It is an emirp because it is prime and its reverse (94487488621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12688478449 - 2³ = 12688478441 is a prime.

It is not a weakly prime, because it can be changed into another prime (12688478441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6344239224 + 6344239225.

It is an arithmetic number, because the mean of its divisors is an integer number (6344239225).

Almost surely, 2^12688478449 is an apocalyptic number.

It is an amenable number.

12688478449 is a deficient number, since it is larger than the sum of its proper divisors (1).

12688478449 is an equidigital number, since it uses as much as digits as its factorization.

12688478449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24772608, while the sum is 61.

The spelling of 12688478449 in words is "twelve billion, six hundred eighty-eight million, four hundred seventy-eight thousand, four hundred forty-nine".