12661646 has 16 divisors (see below), whose sum is σ = 19415040. Its totient is φ = 6191640.

The previous prime is 12661637. The next prime is 12661667. The reversal of 12661646 is 64616621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19751 + ... + 20381.

It is an arithmetic number, because the mean of its divisors is an integer number (1213440).

Almost surely, 2^12661646 is an apocalyptic number.

12661646 is a deficient number, since it is larger than the sum of its proper divisors (6753394).

12661646 is a wasteful number, since it uses less digits than its factorization.

12661646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839.

The product of its digits is 10368, while the sum is 32.

The square root of 12661646 is about 3558.3206713280. The cubic root of 12661646 is about 233.0755525033.

The spelling of 12661646 in words is "twelve million, six hundred sixty-one thousand, six hundred forty-six".