12685416720281 has 2 divisors, whose sum is σ = 12685416720282. Its totient is φ = 12685416720280.

The previous prime is 12685416720259. The next prime is 12685416720311. The reversal of 12685416720281 is 18202761458621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6598913257225 + 6086503463056 = 2568835^2 + 2467084^2 .

It is an emirp because it is prime and its reverse (18202761458621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12685416720281 - 2¹⁸ = 12685416458137 is a prime.

It is a super-2 number, since 2×12685416720281² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12685416723281) 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, 6342708360140 + 6342708360141.

It is an arithmetic number, because the mean of its divisors is an integer number (6342708360141).

Almost surely, 2^{12685416720281} is an apocalyptic number.

It is an amenable number.

12685416720281 is a deficient number, since it is larger than the sum of its proper divisors (1).

12685416720281 is an equidigital number, since it uses as much as digits as its factorization.

12685416720281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2580480, while the sum is 53.

The spelling of 12685416720281 in words is "twelve trillion, six hundred eighty-five billion, four hundred sixteen million, seven hundred twenty thousand, two hundred eighty-one".