12609666 has 12 divisors (see below), whose sum is σ = 27320982. Its totient is φ = 4203216.

The previous prime is 12609659. The next prime is 12609679. The reversal of 12609666 is 66690621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 184041 = 3525^2 + 429^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12609666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 350251 + ... + 350286.

Almost surely, 2^12609666 is an apocalyptic number.

12609666 is an abundant number, since it is smaller than the sum of its proper divisors (14711316).

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

12609666 is a wasteful number, since it uses less digits than its factorization.

12609666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700545 (or 700542 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 12609666 is about 3551.0091523397. The cubic root of 12609666 is about 232.7561658001.

The spelling of 12609666 in words is "twelve million, six hundred nine thousand, six hundred sixty-six".