12561166 has 8 divisors (see below), whose sum is σ = 19833480. Its totient is φ = 5950008.

The previous prime is 12561163. The next prime is 12561187. The reversal of 12561166 is 66116521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165241 + ... + 165316.

It is an arithmetic number, because the mean of its divisors is an integer number (2479185).

Almost surely, 2^12561166 is an apocalyptic number.

12561166 is a deficient number, since it is larger than the sum of its proper divisors (7272314).

12561166 is a wasteful number, since it uses less digits than its factorization.

12561166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330578.

The product of its digits is 2160, while the sum is 28.

The square root of 12561166 is about 3544.1735284831. The cubic root of 12561166 is about 232.4573691445.

Adding to 12561166 its reverse (66116521), we get a palindrome (78677687).

The spelling of 12561166 in words is "twelve million, five hundred sixty-one thousand, one hundred sixty-six".