12644031668 has 24 divisors (see below), whose sum is σ = 22914683400. Its totient is φ = 6097448448.

The previous prime is 12644031643. The next prime is 12644031671. The reversal of 12644031668 is 86613044621.

It is a happy number.

12644031668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2307649444 + 10336382224 = 48038^2 + 101668^2 .

12644031668 is a modest number, since divided by 31668 gives 12644 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50528 + ... + 166856.

It is an arithmetic number, because the mean of its divisors is an integer number (954778475).

Almost surely, 2^12644031668 is an apocalyptic number.

It is an amenable number.

12644031668 is a deficient number, since it is larger than the sum of its proper divisors (10270651732).

12644031668 is a wasteful number, since it uses less digits than its factorization.

12644031668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117299 (or 117297 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 12644031668 in words is "twelve billion, six hundred forty-four million, thirty-one thousand, six hundred sixty-eight".