12066661 has 4 divisors (see below), whose sum is σ = 12073824. Its totient is φ = 12059500.

The previous prime is 12066641. The next prime is 12066667. The reversal of 12066661 is 16666021.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12066661 - 2¹⁹ = 11542373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12066667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486 + ... + 4936.

It is an arithmetic number, because the mean of its divisors is an integer number (3018456).

Almost surely, 2^12066661 is an apocalyptic number.

It is an amenable number.

12066661 is a deficient number, since it is larger than the sum of its proper divisors (7163).

12066661 is an equidigital number, since it uses as much as digits as its factorization.

12066661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7162.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 12066661 is about 3473.7099763797. The cubic root of 12066661 is about 229.3659981321.

The spelling of 12066661 in words is "twelve million, sixty-six thousand, six hundred sixty-one".