16686685 has 8 divisors (see below), whose sum is σ = 20323296. Its totient is φ = 13149840.

The previous prime is 16686653. The next prime is 16686689. The reversal of 16686685 is 58668661.

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

It is not a de Polignac number, because 16686685 - 2⁵ = 16686653 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 (16686689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24571 + ... + 25240.

It is an arithmetic number, because the mean of its divisors is an integer number (2540412).

Almost surely, 2^16686685 is an apocalyptic number.

It is an amenable number.

16686685 is a deficient number, since it is larger than the sum of its proper divisors (3636611).

16686685 is an equidigital number, since it uses as much as digits as its factorization.

16686685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49883.

The product of its digits is 414720, while the sum is 46.

The square root of 16686685 is about 4084.9339039940. The cubic root of 16686685 is about 255.5387047980.

It can be divided in two parts, 16686 and 685, that added together give a palindrome (17371).

The spelling of 16686685 in words is "sixteen million, six hundred eighty-six thousand, six hundred eighty-five".