12544672709 has 4 divisors (see below), whose sum is σ = 12977247660. Its totient is φ = 12112097760.

The previous prime is 12544672703. The next prime is 12544672711. The reversal of 12544672709 is 90727644521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7690763809 + 4853908900 = 87697^2 + 69670^2 .

It is a cyclic number.

It is not a de Polignac number, because 12544672709 - 2¹² = 12544668613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12544672703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216287432 + ... + 216287489.

It is an arithmetic number, because the mean of its divisors is an integer number (3244311915).

Almost surely, 2^12544672709 is an apocalyptic number.

It is an amenable number.

12544672709 is a deficient number, since it is larger than the sum of its proper divisors (432574951).

12544672709 is an equidigital number, since it uses as much as digits as its factorization.

12544672709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432574950.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 12544672709 in words is "twelve billion, five hundred forty-four million, six hundred seventy-two thousand, seven hundred nine".