12643727646 has 16 divisors (see below), whose sum is σ = 27586315008. Its totient is φ = 3831432600.

The previous prime is 12643727639. The next prime is 12643727683. The reversal of 12643727646 is 64672734621.

It is a junction number, because it is equal to n+sod(n) for n = 12643727595 and 12643727604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95785750 + ... + 95785881.

It is an arithmetic number, because the mean of its divisors is an integer number (1724144688).

Almost surely, 2^12643727646 is an apocalyptic number.

12643727646 is an abundant number, since it is smaller than the sum of its proper divisors (14942587362).

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

12643727646 is a wasteful number, since it uses less digits than its factorization.

12643727646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191571647.

The product of its digits is 2032128, while the sum is 48.

The spelling of 12643727646 in words is "twelve billion, six hundred forty-three million, seven hundred twenty-seven thousand, six hundred forty-six".