12666525 has 12 divisors (see below), whose sum is σ = 20942112. Its totient is φ = 6755440.

The previous prime is 12666517. The next prime is 12666529. The reversal of 12666525 is 52566621.

It is a happy number.

It is not a de Polignac number, because 12666525 - 2³ = 12666517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666529) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 84369 + ... + 84518.

It is an arithmetic number, because the mean of its divisors is an integer number (1745176).

Almost surely, 2^12666525 is an apocalyptic number.

12666525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12666525 is a deficient number, since it is larger than the sum of its proper divisors (8275587).

12666525 is a wasteful number, since it uses less digits than its factorization.

12666525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168900 (or 168895 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 12666525 is about 3559.0061815063. The cubic root of 12666525 is about 233.1054861993.

The spelling of 12666525 in words is "twelve million, six hundred sixty-six thousand, five hundred twenty-five".