6564247439 has 2 divisors, whose sum is σ = 6564247440. Its totient is φ = 6564247438.

The previous prime is 6564247409. The next prime is 6564247453. The reversal of 6564247439 is 9347424656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6564247439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6564247409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282123719 + 3282123720.

It is an arithmetic number, because the mean of its divisors is an integer number (3282123720).

Almost surely, 2^6564247439 is an apocalyptic number.

6564247439 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564247439 is an equidigital number, since it uses as much as digits as its factorization.

6564247439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 50.

The square root of 6564247439 is about 81020.0434398797. The cubic root of 6564247439 is about 1872.3842579007.

The spelling of 6564247439 in words is "six billion, five hundred sixty-four million, two hundred forty-seven thousand, four hundred thirty-nine".