12345666 has 8 divisors (see below), whose sum is σ = 24691344. Its totient is φ = 4115220.

The previous prime is 12345653. The next prime is 12345701. The reversal of 12345666 is 66654321.

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

12345666 is an admirable number.

It is a Curzon number.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1028800 + ... + 1028811.

It is an arithmetic number, because the mean of its divisors is an integer number (3086418).

Almost surely, 2^12345666 is an apocalyptic number.

12345666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12345666 is a wasteful number, since it uses less digits than its factorization.

12345666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057616.

The product of its digits is 25920, while the sum is 33.

The square root of 12345666 is about 3513.6399929418. The cubic root of 12345666 is about 231.1203435832.

Adding to 12345666 its reverse (66654321), we get a palindrome (78999987).

The spelling of 12345666 in words is "twelve million, three hundred forty-five thousand, six hundred sixty-six".