12643563 has 8 divisors (see below), whose sum is σ = 17849808. Its totient is φ = 7933184.

The previous prime is 12643549. The next prime is 12643571. The reversal of 12643563 is 36534621.

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

It is a cyclic number.

It is not a de Polignac number, because 12643563 - 2¹² = 12639467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12643563.

It is not an unprimeable number, because it can be changed into a prime (12643513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123906 + ... + 124007.

It is an arithmetic number, because the mean of its divisors is an integer number (2231226).

Almost surely, 2^12643563 is an apocalyptic number.

12643563 is a deficient number, since it is larger than the sum of its proper divisors (5206245).

12643563 is a wasteful number, since it uses less digits than its factorization.

12643563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247933.

The product of its digits is 12960, while the sum is 30.

The square root of 12643563 is about 3555.7788176432. The cubic root of 12643563 is about 232.9645423642.

The spelling of 12643563 in words is "twelve million, six hundred forty-three thousand, five hundred sixty-three".