16611689 has 2 divisors, whose sum is σ = 16611690. Its totient is φ = 16611688.

The previous prime is 16611641. The next prime is 16611701. The reversal of 16611689 is 98611661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 4305625 = 3508^2 + 2075^2 .

It is an emirp because it is prime and its reverse (98611661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16611689 - 2⁸ = 16611433 is a prime.

It is a super-2 number, since 2×16611689² = 551896422865442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16611619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8305844 + 8305845.

It is an arithmetic number, because the mean of its divisors is an integer number (8305845).

Almost surely, 2^16611689 is an apocalyptic number.

It is an amenable number.

16611689 is a deficient number, since it is larger than the sum of its proper divisors (1).

16611689 is an equidigital number, since it uses as much as digits as its factorization.

16611689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 16611689 is about 4075.7439811647. The cubic root of 16611689 is about 255.1553020399.

The spelling of 16611689 in words is "sixteen million, six hundred eleven thousand, six hundred eighty-nine".