12643855456 has 24 divisors (see below), whose sum is σ = 25031666520. Its totient is φ = 6286606848.

The previous prime is 12643855453. The next prime is 12643855529. The reversal of 12643855456 is 65455834621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643855453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097961 + ... + 1109416.

It is an arithmetic number, because the mean of its divisors is an integer number (1042986105).

Almost surely, 2^12643855456 is an apocalyptic number.

12643855456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12643855456 is a deficient number, since it is larger than the sum of its proper divisors (12387811064).

12643855456 is a wasteful number, since it uses less digits than its factorization.

12643855456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207566 (or 2207558 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 49.

The spelling of 12643855456 in words is "twelve billion, six hundred forty-three million, eight hundred fifty-five thousand, four hundred fifty-six".