16616009 has 2 divisors, whose sum is σ = 16616010. Its totient is φ = 16616008.

The previous prime is 16615979. The next prime is 16616023. The reversal of 16616009 is 90061661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15976009 + 640000 = 3997^2 + 800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16616009 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16616099) 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 as a sum of consecutive naturals, namely, 8308004 + 8308005.

It is an arithmetic number, because the mean of its divisors is an integer number (8308005).

Almost surely, 2^16616009 is an apocalyptic number.

It is an amenable number.

16616009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16616009 is an equidigital number, since it uses as much as digits as its factorization.

16616009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 16616009 is about 4076.2739113067. The cubic root of 16616009 is about 255.1774185019.

The spelling of 16616009 in words is "sixteen million, six hundred sixteen thousand, nine".