16686361 has 8 divisors (see below), whose sum is σ = 17123400. Its totient is φ = 16253952.

The previous prime is 16686353. The next prime is 16686391. The reversal of 16686361 is 16368661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 129600 + 16556761 = 360^2 + 4069^2 .

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 16686361 - 2³ = 16686353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16686361.

It is not an unprimeable number, because it can be changed into a prime (16686331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6841 + ... + 8953.

It is an arithmetic number, because the mean of its divisors is an integer number (2140425).

Almost surely, 2^16686361 is an apocalyptic number.

It is an amenable number.

16686361 is a deficient number, since it is larger than the sum of its proper divisors (437039).

16686361 is a wasteful number, since it uses less digits than its factorization.

16686361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315.

The product of its digits is 31104, while the sum is 37.

The square root of 16686361 is about 4084.8942458771. The cubic root of 16686361 is about 255.5370508830.

The spelling of 16686361 in words is "sixteen million, six hundred eighty-six thousand, three hundred sixty-one".