12985566 has 16 divisors (see below), whose sum is σ = 28332288. Its totient is φ = 3935000.

The previous prime is 12985549. The next prime is 12985597. The reversal of 12985566 is 66558921.

12985566 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

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, 98310 + ... + 98441.

It is an arithmetic number, because the mean of its divisors is an integer number (1770768).

Almost surely, 2^12985566 is an apocalyptic number.

12985566 is an abundant number, since it is smaller than the sum of its proper divisors (15346722).

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

12985566 is a wasteful number, since it uses less digits than its factorization.

12985566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196767.

The product of its digits is 129600, while the sum is 42.

The square root of 12985566 is about 3603.5490838894. The cubic root of 12985566 is about 235.0464130449.

It can be divided in two parts, 129855 and 66, that added together give a palindrome (129921).

The spelling of 12985566 in words is "twelve million, nine hundred eighty-five thousand, five hundred sixty-six".