16641666 has 64 divisors (see below), whose sum is σ = 38707200. Its totient is φ = 5295888.

The previous prime is 16641649. The next prime is 16641697. The reversal of 16641666 is 66614661.

It is a self number, because there is not a number n which added to its sum of digits gives 16641666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200461 + ... + 200543.

It is an arithmetic number, because the mean of its divisors is an integer number (604800).

Almost surely, 2^16641666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16641666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19353600).

16641666 is an abundant number, since it is smaller than the sum of its proper divisors (22065534).

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

16641666 is a wasteful number, since it uses less digits than its factorization.

16641666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 214 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 16641666 is about 4079.4198116889. The cubic root of 16641666 is about 255.3086919042.

The spelling of 16641666 in words is "sixteen million, six hundred forty-one thousand, six hundred sixty-six".