12644431330420 has 96 divisors (see below), whose sum is σ = 28164403669248. Its totient is φ = 4751943985152.

The previous prime is 12644431330417. The next prime is 12644431330423. The reversal of 12644431330420 is 2403313444621.

It is an interprime number because it is at equal distance from previous prime (12644431330417) and next prime (12644431330423).

It is a self number, because there is not a number n which added to its sum of digits gives 12644431330420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12644431330423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487567774 + ... + 487593706.

It is an arithmetic number, because the mean of its divisors is an integer number (293379204888).

Almost surely, 2^{12644431330420} is an apocalyptic number.

12644431330420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12644431330420 is an abundant number, since it is smaller than the sum of its proper divisors (15519972338828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12644431330420 is a wasteful number, since it uses less digits than its factorization.

12644431330420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28409 (or 28407 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 37.

The spelling of 12644431330420 in words is "twelve trillion, six hundred forty-four billion, four hundred thirty-one million, three hundred thirty thousand, four hundred twenty".