16684165 has 4 divisors (see below), whose sum is σ = 20021004. Its totient is φ = 13347328.

The previous prime is 16684159. The next prime is 16684181. The reversal of 16684165 is 56148661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56148661 = 1187 ⋅47303.

It can be written as a sum of positive squares in 2 ways, for example, as 11874916 + 4809249 = 3446^2 + 2193^2 .

It is a cyclic number.

It is not a de Polignac number, because 16684165 - 2²³ = 8295557 is a prime.

It is a super-2 number, since 2×16684165² = 556722723494450, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1668412 + ... + 1668421.

It is an arithmetic number, because the mean of its divisors is an integer number (5005251).

Almost surely, 2^16684165 is an apocalyptic number.

It is an amenable number.

16684165 is a deficient number, since it is larger than the sum of its proper divisors (3336839).

16684165 is an equidigital number, since it uses as much as digits as its factorization.

16684165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336838.

The product of its digits is 34560, while the sum is 37.

The square root of 16684165 is about 4084.6254418245. The cubic root of 16684165 is about 255.5258404503.

The spelling of 16684165 in words is "sixteen million, six hundred eighty-four thousand, one hundred sixty-five".