6564720889 has 2 divisors, whose sum is σ = 6564720890. Its totient is φ = 6564720888.

The previous prime is 6564720887. The next prime is 6564720917. The reversal of 6564720889 is 9880274656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3424239289 + 3140481600 = 58517^2 + 56040^2 .

It is a cyclic number.

It is not a de Polignac number, because 6564720889 - 2¹ = 6564720887 is a prime.

Together with 6564720887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6564720887) 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, 3282360444 + 3282360445.

It is an arithmetic number, because the mean of its divisors is an integer number (3282360445).

Almost surely, 2^6564720889 is an apocalyptic number.

It is an amenable number.

6564720889 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564720889 is an equidigital number, since it uses as much as digits as its factorization.

6564720889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The square root of 6564720889 is about 81022.9651950606. The cubic root of 6564720889 is about 1872.4292724041.

The spelling of 6564720889 in words is "six billion, five hundred sixty-four million, seven hundred twenty thousand, eight hundred eighty-nine".