12566646 has 24 divisors (see below), whose sum is σ = 27691560. Its totient is φ = 4117536.

The previous prime is 12566639. The next prime is 12566647. The reversal of 12566646 is 64666521.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 12566646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12566647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4855 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (1153815).

Almost surely, 2^12566646 is an apocalyptic number.

12566646 is an abundant number, since it is smaller than the sum of its proper divisors (15124914).

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

12566646 is a wasteful number, since it uses less digits than its factorization.

12566646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11900 (or 11897 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 12566646 is about 3544.9465440257. The cubic root of 12566646 is about 232.4911685858.

The spelling of 12566646 in words is "twelve million, five hundred sixty-six thousand, six hundred forty-six".