16003666 has 16 divisors (see below), whose sum is σ = 27607104. Its totient is φ = 6815664.

The previous prime is 16003661. The next prime is 16003667. The reversal of 16003666 is 66630061.

It is a super-2 number, since 2×16003666² = 512234650879112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16003661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1225 + ... + 5788.

It is an arithmetic number, because the mean of its divisors is an integer number (1725444).

Almost surely, 2^16003666 is an apocalyptic number.

16003666 is a deficient number, since it is larger than the sum of its proper divisors (11603438).

16003666 is a wasteful number, since it uses less digits than its factorization.

16003666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7185.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 16003666 is about 4000.4582237539. The cubic root of 16003666 is about 252.0034538033.

The spelling of 16003666 in words is "sixteen million, three thousand, six hundred sixty-six".