6564549749 has 2 divisors, whose sum is σ = 6564549750. Its totient is φ = 6564549748.

The previous prime is 6564549703. The next prime is 6564549751. The reversal of 6564549749 is 9479454656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4653286225 + 1911263524 = 68215^2 + 43718^2 .

It is a cyclic number.

It is not a de Polignac number, because 6564549749 - 2²⁰ = 6563501173 is a prime.

Together with 6564549751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6564549149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282274874 + 3282274875.

It is an arithmetic number, because the mean of its divisors is an integer number (3282274875).

Almost surely, 2^6564549749 is an apocalyptic number.

It is an amenable number.

6564549749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564549749 is an equidigital number, since it uses as much as digits as its factorization.

6564549749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 59.

The square root of 6564549749 is about 81021.9090678565. The cubic root of 6564549749 is about 1872.4130010685.

The spelling of 6564549749 in words is "six billion, five hundred sixty-four million, five hundred forty-nine thousand, seven hundred forty-nine".