12644843545 has 8 divisors (see below), whose sum is σ = 15197488200. Its totient is φ = 10100090880.

The previous prime is 12644843543. The next prime is 12644843599. The reversal of 12644843545 is 54534844621.

It can be written as a sum of positive squares in 4 ways, for example, as 504990784 + 12139852761 = 22472^2 + 110181^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12644843545 - 2¹ = 12644843543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12644843495 and 12644843504.

It is not an unprimeable number, because it can be changed into a prime (12644843543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1969470 + ... + 1975879.

It is an arithmetic number, because the mean of its divisors is an integer number (1899686025).

Almost surely, 2^12644843545 is an apocalyptic number.

It is an amenable number.

12644843545 is a deficient number, since it is larger than the sum of its proper divisors (2552644655).

12644843545 is an equidigital number, since it uses as much as digits as its factorization.

12644843545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945995.

The product of its digits is 1843200, while the sum is 46.

The spelling of 12644843545 in words is "twelve billion, six hundred forty-four million, eight hundred forty-three thousand, five hundred forty-five".