12635285809 has 2 divisors, whose sum is σ = 12635285810. Its totient is φ = 12635285808.

The previous prime is 12635285801. The next prime is 12635285821. The reversal of 12635285809 is 90858253621.

It is a happy number.

12635285809 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., 12006680625 + 628605184 = 109575^2 + 25072^2 .

It is a cyclic number.

It is not a de Polignac number, because 12635285809 - 2³ = 12635285801 is a prime.

It is not a weakly prime, because it can be changed into another prime (12635285801) 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, 6317642904 + 6317642905.

It is an arithmetic number, because the mean of its divisors is an integer number (6317642905).

Almost surely, 2^12635285809 is an apocalyptic number.

It is an amenable number.

12635285809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12635285809 is an equidigital number, since it uses as much as digits as its factorization.

12635285809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 12635285809 in words is "twelve billion, six hundred thirty-five million, two hundred eighty-five thousand, eight hundred nine".