6622556209 has 2 divisors, whose sum is σ = 6622556210. Its totient is φ = 6622556208.

The previous prime is 6622556207. The next prime is 6622556219. The reversal of 6622556209 is 9026552266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6372030625 + 250525584 = 79825^2 + 15828^2 .

It is a cyclic number.

It is not a de Polignac number, because 6622556209 - 2¹ = 6622556207 is a prime.

Together with 6622556207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6622556207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3311278104 + 3311278105.

It is an arithmetic number, because the mean of its divisors is an integer number (3311278105).

Almost surely, 2^6622556209 is an apocalyptic number.

It is an amenable number.

6622556209 is a deficient number, since it is larger than the sum of its proper divisors (1).

6622556209 is an equidigital number, since it uses as much as digits as its factorization.

6622556209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 43.

The square root of 6622556209 is about 81379.0895070718. The cubic root of 6622556209 is about 1877.9119159469.

The spelling of 6622556209 in words is "six billion, six hundred twenty-two million, five hundred fifty-six thousand, two hundred nine".