12708649409 has 2 divisors, whose sum is σ = 12708649410. Its totient is φ = 12708649408.

The previous prime is 12708649313. The next prime is 12708649433. The reversal of 12708649409 is 90494680721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12448311184 + 260338225 = 111572^2 + 16135^2 .

It is a cyclic number.

It is not a de Polignac number, because 12708649409 - 2⁸ = 12708649153 is a prime.

It is not a weakly prime, because it can be changed into another prime (12708619409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6354324704 + 6354324705.

It is an arithmetic number, because the mean of its divisors is an integer number (6354324705).

Almost surely, 2^12708649409 is an apocalyptic number.

It is an amenable number.

12708649409 is a deficient number, since it is larger than the sum of its proper divisors (1).

12708649409 is an equidigital number, since it uses as much as digits as its factorization.

12708649409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 12708649409 in words is "twelve billion, seven hundred eight million, six hundred forty-nine thousand, four hundred nine".