12001666 has 8 divisors (see below), whose sum is σ = 18017280. Its totient is φ = 5995908.

The previous prime is 12001571. The next prime is 12001667. The reversal of 12001666 is 66610021.

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

It is not an unprimeable number, because it can be changed into a prime (12001667) 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, 3055 + ... + 5773.

It is an arithmetic number, because the mean of its divisors is an integer number (2252160).

Almost surely, 2^12001666 is an apocalyptic number.

12001666 is a deficient number, since it is larger than the sum of its proper divisors (6015614).

12001666 is a wasteful number, since it uses less digits than its factorization.

12001666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4928.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 12001666 is about 3464.3420731793. The cubic root of 12001666 is about 228.9534429867.

Adding to 12001666 its reverse (66610021), we get a palindrome (78611687).

The spelling of 12001666 in words is "twelve million, one thousand, six hundred sixty-six".