16686925 has 6 divisors (see below), whose sum is σ = 20691818. Its totient is φ = 13349520.

The previous prime is 16686907. The next prime is 16686931. The reversal of 16686925 is 52968661.

It can be written as a sum of positive squares in 3 ways, for example, as 3884841 + 12802084 = 1971^2 + 3578^2 .

It is not a de Polignac number, because 16686925 - 2⁵ = 16686893 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 (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333714 + ... + 333763.

Almost surely, 2^16686925 is an apocalyptic number.

It is an amenable number.

16686925 is a deficient number, since it is larger than the sum of its proper divisors (4004893).

16686925 is an equidigital number, since it uses as much as digits as its factorization.

16686925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667487 (or 667482 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 16686925 is about 4084.9632801287. The cubic root of 16686925 is about 255.5399299065.

The spelling of 16686925 in words is "sixteen million, six hundred eighty-six thousand, nine hundred twenty-five".