16680161 has 8 divisors (see below), whose sum is σ = 16971240. Its totient is φ = 16391808.

The previous prime is 16680137. The next prime is 16680163. The reversal of 16680161 is 16108661.

It can be written as a sum of positive squares in 4 ways, for example, as 1030225 + 15649936 = 1015^2 + 3956^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16680161 - 2¹⁰ = 16679137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16680163) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14375 + ... + 15491.

It is an arithmetic number, because the mean of its divisors is an integer number (2121405).

Almost surely, 2^16680161 is an apocalyptic number.

It is an amenable number.

16680161 is a deficient number, since it is larger than the sum of its proper divisors (291079).

16680161 is a wasteful number, since it uses less digits than its factorization.

16680161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 16680161 is about 4084.1352817947. The cubic root of 16680161 is about 255.5053977666.

The spelling of 16680161 in words is "sixteen million, six hundred eighty thousand, one hundred sixty-one".