16660216 has 8 divisors (see below), whose sum is σ = 31237920. Its totient is φ = 8330104.

The previous prime is 16660157. The next prime is 16660219. The reversal of 16660216 is 61206661.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16660219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1041256 + ... + 1041271.

It is an arithmetic number, because the mean of its divisors is an integer number (3904740).

Almost surely, 2^16660216 is an apocalyptic number.

It is an amenable number.

16660216 is a deficient number, since it is larger than the sum of its proper divisors (14577704).

16660216 is a wasteful number, since it uses less digits than its factorization.

16660216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082533 (or 2082529 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 16660216 is about 4081.6927860877. The cubic root of 16660216 is about 255.4035185006.

Adding to 16660216 its reverse (61206661), we get a palindrome (77866877).

The spelling of 16660216 in words is "sixteen million, six hundred sixty thousand, two hundred sixteen".