16681285 has 8 divisors (see below), whose sum is σ = 20063736. Its totient is φ = 13314240.

The previous prime is 16681277. The next prime is 16681307. The reversal of 16681285 is 58218661.

It can be written as a sum of positive squares in 4 ways, for example, as 1572516 + 15108769 = 1254^2 + 3887^2 .

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

It is not a de Polignac number, because 16681285 - 2³ = 16681277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1314 + ... + 5923.

It is an arithmetic number, because the mean of its divisors is an integer number (2507967).

Almost surely, 2^16681285 is an apocalyptic number.

It is an amenable number.

16681285 is a deficient number, since it is larger than the sum of its proper divisors (3382451).

16681285 is an equidigital number, since it uses as much as digits as its factorization.

16681285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7703.

The product of its digits is 23040, while the sum is 37.

The square root of 16681285 is about 4084.2728851045. The cubic root of 16681285 is about 255.5111367523.

The spelling of 16681285 in words is "sixteen million, six hundred eighty-one thousand, two hundred eighty-five".