16681689 has 12 divisors (see below), whose sum is σ = 24873472. Its totient is φ = 10762200.

The previous prime is 16681681. The next prime is 16681703. The reversal of 16681689 is 98618661.

It is a happy number.

It is not a de Polignac number, because 16681689 - 2³ = 16681681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16681681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29617 + ... + 30174.

Almost surely, 2^16681689 is an apocalyptic number.

It is an amenable number.

16681689 is a deficient number, since it is larger than the sum of its proper divisors (8191783).

16681689 is a wasteful number, since it uses less digits than its factorization.

16681689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59828 (or 59825 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 16681689 is about 4084.3223428128. The cubic root of 16681689 is about 255.5131994565.

The spelling of 16681689 in words is "sixteen million, six hundred eighty-one thousand, six hundred eighty-nine".