6564490217 has 2 divisors, whose sum is σ = 6564490218. Its totient is φ = 6564490216.

The previous prime is 6564490189. The next prime is 6564490301. The reversal of 6564490217 is 7120944656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6074487721 + 490002496 = 77939^2 + 22136^2 .

It is a cyclic number.

It is not a de Polignac number, because 6564490217 - 2¹⁴ = 6564473833 is a prime.

It is not a weakly prime, because it can be changed into another prime (6564420217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282245108 + 3282245109.

It is an arithmetic number, because the mean of its divisors is an integer number (3282245109).

Almost surely, 2^6564490217 is an apocalyptic number.

It is an amenable number.

6564490217 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564490217 is an equidigital number, since it uses as much as digits as its factorization.

6564490217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 6564490217 is about 81021.5416849124. The cubic root of 6564490217 is about 1872.4073409277.

The spelling of 6564490217 in words is "six billion, five hundred sixty-four million, four hundred ninety thousand, two hundred seventeen".