12015666 has 24 divisors (see below), whose sum is σ = 28037100. Its totient is φ = 3697056.

The previous prime is 12015659. The next prime is 12015677. The reversal of 12015666 is 66651021.

It is a happy number.

12015666 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 9828225 + 2187441 = 3135^2 + 1479^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25441 + ... + 25908.

Almost surely, 2^12015666 is an apocalyptic number.

12015666 is an abundant number, since it is smaller than the sum of its proper divisors (16021434).

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

12015666 is a wasteful number, since it uses less digits than its factorization.

12015666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51370 (or 51367 counting only the distinct ones).

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

The square root of 12015666 is about 3466.3620699517. The cubic root of 12015666 is about 229.0424334834.

Adding to 12015666 its reverse (66651021), we get a palindrome (78666687).

The spelling of 12015666 in words is "twelve million, fifteen thousand, six hundred sixty-six".