12644032601 has 4 divisors (see below), whose sum is σ = 12644299572. Its totient is φ = 12643765632.

The previous prime is 12644032573. The next prime is 12644032649. The reversal of 12644032601 is 10623044621.

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 11984775625 + 659256976 = 109475^2 + 25676^2 .

It is a cyclic number.

It is not a de Polignac number, because 12644032601 - 2⁶ = 12644032537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12644032301) 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, 41156 + ... + 164261.

It is an arithmetic number, because the mean of its divisors is an integer number (3161074893).

Almost surely, 2^12644032601 is an apocalyptic number.

It is an amenable number.

12644032601 is a deficient number, since it is larger than the sum of its proper divisors (266971).

12644032601 is an equidigital number, since it uses as much as digits as its factorization.

12644032601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266970.

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 12644032601 in words is "twelve billion, six hundred forty-four million, thirty-two thousand, six hundred one".