12661566 has 16 divisors (see below), whose sum is σ = 26812944. Its totient is φ = 3972224.

The previous prime is 12661499. The next prime is 12661589. The reversal of 12661566 is 66516621.

12661566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 61965 + ... + 62168.

It is an arithmetic number, because the mean of its divisors is an integer number (1675809).

Almost surely, 2^12661566 is an apocalyptic number.

12661566 is an abundant number, since it is smaller than the sum of its proper divisors (14151378).

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

12661566 is a wasteful number, since it uses less digits than its factorization.

12661566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124155.

The product of its digits is 12960, while the sum is 33.

The square root of 12661566 is about 3558.3094300524. The cubic root of 12661566 is about 233.0750616223.

The spelling of 12661566 in words is "twelve million, six hundred sixty-one thousand, five hundred sixty-six".