16443666 has 24 divisors (see below), whose sum is σ = 37177920. Its totient is φ = 5242776.

The previous prime is 16443659. The next prime is 16443677. The reversal of 16443666 is 66634461.

It is a super-3 number, since 3×16443666³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16443666.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 19446 + ... + 20273.

It is an arithmetic number, because the mean of its divisors is an integer number (1549080).

Almost surely, 2^16443666 is an apocalyptic number.

16443666 is an abundant number, since it is smaller than the sum of its proper divisors (20734254).

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

16443666 is a wasteful number, since it uses less digits than its factorization.

16443666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39750 (or 39747 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 16443666 is about 4055.0790374541. The cubic root of 16443666 is about 254.2921081889.

The spelling of 16443666 in words is "sixteen million, four hundred forty-three thousand, six hundred sixty-six".