12051666 has 40 divisors (see below), whose sum is σ = 29463984. Its totient is φ = 3651480.

The previous prime is 12051659. The next prime is 12051679. The reversal of 12051666 is 66615021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1600 + ... + 5163.

Almost surely, 2^12051666 is an apocalyptic number.

12051666 is an abundant number, since it is smaller than the sum of its proper divisors (17412318).

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

12051666 is a wasteful number, since it uses less digits than its factorization.

12051666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6788 (or 6779 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 12051666 is about 3471.5509502238. The cubic root of 12051666 is about 229.2709492258.

Adding to 12051666 its reverse (66615021), we get a palindrome (78666687).

The spelling of 12051666 in words is "twelve million, fifty-one thousand, six hundred sixty-six".