16695689 has 4 divisors (see below), whose sum is σ = 17010756. Its totient is φ = 16380624.

The previous prime is 16695671. The next prime is 16695697. The reversal of 16695689 is 98659661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12369289 + 4326400 = 3517^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 16695689 - 2¹² = 16691593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16695659) by changing a digit.

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, 157454 + ... + 157559.

It is an arithmetic number, because the mean of its divisors is an integer number (4252689).

Almost surely, 2^16695689 is an apocalyptic number.

It is an amenable number.

16695689 is a deficient number, since it is larger than the sum of its proper divisors (315067).

16695689 is an equidigital number, since it uses as much as digits as its factorization.

16695689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315066.

The product of its digits is 699840, while the sum is 50.

The square root of 16695689 is about 4086.0358539788. The cubic root of 16695689 is about 255.5846587383.

The spelling of 16695689 in words is "sixteen million, six hundred ninety-five thousand, six hundred eighty-nine".