12505566 has 16 divisors (see below), whose sum is σ = 25106688. Its totient is φ = 4152600.

The previous prime is 12505543. The next prime is 12505579. The reversal of 12505566 is 66550521.

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, 2220 + ... + 5471.

It is an arithmetic number, because the mean of its divisors is an integer number (1569168).

Almost surely, 2^12505566 is an apocalyptic number.

12505566 is an abundant number, since it is smaller than the sum of its proper divisors (12601122).

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

12505566 is a wasteful number, since it uses less digits than its factorization.

12505566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7967.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 12505566 is about 3536.3209695954. The cubic root of 12505566 is about 232.1138833470.

The spelling of 12505566 in words is "twelve million, five hundred five thousand, five hundred sixty-six".