12644430331 has 8 divisors (see below), whose sum is σ = 14086633680. Its totient is φ = 11269306272.

The previous prime is 12644430329. The next prime is 12644430341. The reversal of 12644430331 is 13303444621.

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

It is not a de Polignac number, because 12644430331 - 2¹ = 12644430329 is a prime.

It is a super-2 number, since 2×12644430331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12644430293 and 12644430302.

It is not an unprimeable number, because it can be changed into a prime (12644430341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16769425 + ... + 16770178.

It is an arithmetic number, because the mean of its divisors is an integer number (1760829210).

Almost surely, 2^12644430331 is an apocalyptic number.

12644430331 is a deficient number, since it is larger than the sum of its proper divisors (1442203349).

12644430331 is a wasteful number, since it uses less digits than its factorization.

12644430331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33539645.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 12644430331 its reverse (13303444621), we get a palindrome (25947874952).

The spelling of 12644430331 in words is "twelve billion, six hundred forty-four million, four hundred thirty thousand, three hundred thirty-one".