16580909 has 2 divisors, whose sum is σ = 16580910. Its totient is φ = 16580908.

The previous prime is 16580887. The next prime is 16580911. The reversal of 16580909 is 90908561.

16580909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8684809 + 7896100 = 2947^2 + 2810^2 .

It is a cyclic number.

It is not a de Polignac number, because 16580909 - 2⁸ = 16580653 is a prime.

Together with 16580911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16580609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8290454 + 8290455.

It is an arithmetic number, because the mean of its divisors is an integer number (8290455).

Almost surely, 2^16580909 is an apocalyptic number.

It is an amenable number.

16580909 is a deficient number, since it is larger than the sum of its proper divisors (1).

16580909 is an equidigital number, since it uses as much as digits as its factorization.

16580909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 16580909 is about 4071.9662326694. The cubic root of 16580909 is about 254.9976111528.

The spelling of 16580909 in words is "sixteen million, five hundred eighty thousand, nine hundred nine".