12781088686481 has 2 divisors, whose sum is σ = 12781088686482. Its totient is φ = 12781088686480.

The previous prime is 12781088686459. The next prime is 12781088686511. The reversal of 12781088686481 is 18468688018721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12570995713600 + 210092972881 = 3545560^2 + 458359^2 .

It is an emirp because it is prime and its reverse (18468688018721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12781088686481 - 2⁶ = 12781088686417 is a prime.

It is a super-2 number, since 2×12781088686481² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12781088686411) 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, 6390544343240 + 6390544343241.

It is an arithmetic number, because the mean of its divisors is an integer number (6390544343241).

Almost surely, 2^{12781088686481} is an apocalyptic number.

It is an amenable number.

12781088686481 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781088686481 is an equidigital number, since it uses as much as digits as its factorization.

12781088686481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 66060288, while the sum is 68.

The spelling of 12781088686481 in words is "twelve trillion, seven hundred eighty-one billion, eighty-eight million, six hundred eighty-six thousand, four hundred eighty-one".