16040666 has 4 divisors (see below), whose sum is σ = 24061002. Its totient is φ = 8020332.

The previous prime is 16040659. The next prime is 16040669. The reversal of 16040666 is 66604061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14784025 + 1256641 = 3845^2 + 1121^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16040669) 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 as a sum of consecutive naturals, namely, 4010165 + ... + 4010168.

Almost surely, 2^16040666 is an apocalyptic number.

16040666 is a deficient number, since it is larger than the sum of its proper divisors (8020336).

16040666 is an equidigital number, since it uses as much as digits as its factorization.

16040666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8020335.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 16040666 is about 4005.0800241693. The cubic root of 16040666 is about 252.1975124918.

The spelling of 16040666 in words is "sixteen million, forty thousand, six hundred sixty-six".