6564578473 has 2 divisors, whose sum is σ = 6564578474. Its totient is φ = 6564578472.

The previous prime is 6564578459. The next prime is 6564578477. The reversal of 6564578473 is 3748754656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4045341609 + 2519236864 = 63603^2 + 50192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6564578473 is a prime.

It is not a weakly prime, because it can be changed into another prime (6564578477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282289236 + 3282289237.

It is an arithmetic number, because the mean of its divisors is an integer number (3282289237).

Almost surely, 2^6564578473 is an apocalyptic number.

It is an amenable number.

6564578473 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564578473 is an equidigital number, since it uses as much as digits as its factorization.

6564578473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16934400, while the sum is 55.

The square root of 6564578473 is about 81022.0863283586. The cubic root of 6564578473 is about 1872.4157320561.

The spelling of 6564578473 in words is "six billion, five hundred sixty-four million, five hundred seventy-eight thousand, four hundred seventy-three".