12666169 has 4 divisors (see below), whose sum is σ = 13216896. Its totient is φ = 12115444.

The previous prime is 12666167. The next prime is 12666191. The reversal of 12666169 is 96166621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96166621 = 79 ⋅1217299.

It is a cyclic number.

It is not a de Polignac number, because 12666169 - 2¹ = 12666167 is a prime.

It is a super-2 number, since 2×12666169² = 320863674273122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12666167) 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, 275329 + ... + 275374.

It is an arithmetic number, because the mean of its divisors is an integer number (3304224).

Almost surely, 2^12666169 is an apocalyptic number.

It is an amenable number.

12666169 is a deficient number, since it is larger than the sum of its proper divisors (550727).

12666169 is an equidigital number, since it uses as much as digits as its factorization.

12666169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550726.

The product of its digits is 23328, while the sum is 37.

The square root of 12666169 is about 3558.9561671928. The cubic root of 12666169 is about 233.1033023240.

The spelling of 12666169 in words is "twelve million, six hundred sixty-six thousand, one hundred sixty-nine".