12548399609 has 4 divisors (see below), whose sum is σ = 12754111140. Its totient is φ = 12342688080.

The previous prime is 12548399597. The next prime is 12548399623. The reversal of 12548399609 is 90699384521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90699384521 = 17 ⋅5335257913.

It can be written as a sum of positive squares in 2 ways, for example, as 7090145209 + 5458254400 = 84203^2 + 73880^2 .

It is a cyclic number.

It is not a de Polignac number, because 12548399609 - 2¹² = 12548395513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12548399659) 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, 102855674 + ... + 102855795.

It is an arithmetic number, because the mean of its divisors is an integer number (3188527785).

Almost surely, 2^12548399609 is an apocalyptic number.

It is an amenable number.

12548399609 is a deficient number, since it is larger than the sum of its proper divisors (205711531).

12548399609 is an equidigital number, since it uses as much as digits as its factorization.

12548399609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205711530.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The spelling of 12548399609 in words is "twelve billion, five hundred forty-eight million, three hundred ninety-nine thousand, six hundred nine".