16731666 has 96 divisors (see below), whose sum is σ = 45302400. Its totient is φ = 4354560.

The previous prime is 16731641. The next prime is 16731677. The reversal of 16731666 is 66613761.

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16731666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69306 + ... + 69546.

It is an arithmetic number, because the mean of its divisors is an integer number (471900).

Almost surely, 2^16731666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16731666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22651200).

16731666 is an abundant number, since it is smaller than the sum of its proper divisors (28570734).

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

16731666 is a wasteful number, since it uses less digits than its factorization.

16731666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 301 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 16731666 is about 4090.4359180899. The cubic root of 16731666 is about 255.7681107335.

The spelling of 16731666 in words is "sixteen million, seven hundred thirty-one thousand, six hundred sixty-six".