6564422561 has 4 divisors (see below), whose sum is σ = 6567168132. Its totient is φ = 6561676992.

The previous prime is 6564422549. The next prime is 6564422563. The reversal of 6564422561 is 1652244656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3641398336 + 2923024225 = 60344^2 + 54065^2 .

It is a cyclic number.

It is not a de Polignac number, because 6564422561 - 2¹⁰ = 6564421537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6564422563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1369196 + ... + 1373981.

It is an arithmetic number, because the mean of its divisors is an integer number (1641792033).

Almost surely, 2^6564422561 is an apocalyptic number.

It is an amenable number.

6564422561 is a deficient number, since it is larger than the sum of its proper divisors (2745571).

6564422561 is a wasteful number, since it uses less digits than its factorization.

6564422561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745570.

The product of its digits is 345600, while the sum is 41.

The square root of 6564422561 is about 81021.1241652447. The cubic root of 6564422561 is about 1872.4009083375.

The spelling of 6564422561 in words is "six billion, five hundred sixty-four million, four hundred twenty-two thousand, five hundred sixty-one".