12643384440 has 32 divisors (see below), whose sum is σ = 37930153680. Its totient is φ = 3371569152.

The previous prime is 12643384423. The next prime is 12643384451. The reversal of 12643384440 is 4448334621.

It is a super-3 number, since 3×12643384440³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 52680649 + ... + 52680888.

Almost surely, 2^12643384440 is an apocalyptic number.

12643384440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12643384440 is an abundant number, since it is smaller than the sum of its proper divisors (25286769240).

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

12643384440 is a wasteful number, since it uses less digits than its factorization.

12643384440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105361551 (or 105361547 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 39.

The spelling of 12643384440 in words is "twelve billion, six hundred forty-three million, three hundred eighty-four thousand, four hundred forty".