16680317 has 4 divisors (see below), whose sum is σ = 17087196. Its totient is φ = 16273440.

The previous prime is 16680311. The next prime is 16680331. The reversal of 16680317 is 71308661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4990756 + 11689561 = 2234^2 + 3419^2 .

It is a cyclic number.

It is not a de Polignac number, because 16680317 - 2⁸ = 16680061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16680311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203378 + ... + 203459.

It is an arithmetic number, because the mean of its divisors is an integer number (4271799).

Almost surely, 2^16680317 is an apocalyptic number.

It is an amenable number.

16680317 is a deficient number, since it is larger than the sum of its proper divisors (406879).

16680317 is an equidigital number, since it uses as much as digits as its factorization.

16680317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406878.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 16680317 is about 4084.1543800400. The cubic root of 16680317 is about 255.5061942961.

Adding to 16680317 its reverse (71308661), we get a palindrome (87988978).

The spelling of 16680317 in words is "sixteen million, six hundred eighty thousand, three hundred seventeen".