12686451509 has 2 divisors, whose sum is σ = 12686451510. Its totient is φ = 12686451508.

The previous prime is 12686451499. The next prime is 12686451521. The reversal of 12686451509 is 90515468621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8515229284 + 4171222225 = 92278^2 + 64585^2 .

It is a cyclic number.

It is not a de Polignac number, because 12686451509 - 2¹² = 12686447413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12686451529) 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, 6343225754 + 6343225755.

It is an arithmetic number, because the mean of its divisors is an integer number (6343225755).

Almost surely, 2^12686451509 is an apocalyptic number.

It is an amenable number.

12686451509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12686451509 is an equidigital number, since it uses as much as digits as its factorization.

12686451509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 12686451509 in words is "twelve billion, six hundred eighty-six million, four hundred fifty-one thousand, five hundred nine".