6564646423 has 2 divisors, whose sum is σ = 6564646424. Its totient is φ = 6564646422.

The previous prime is 6564646379. The next prime is 6564646447. The reversal of 6564646423 is 3246464656.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6564646423 - 2¹³ = 6564638231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6564644423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282323211 + 3282323212.

It is an arithmetic number, because the mean of its divisors is an integer number (3282323212).

Almost surely, 2^6564646423 is an apocalyptic number.

6564646423 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564646423 is an equidigital number, since it uses as much as digits as its factorization.

6564646423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 46.

The square root of 6564646423 is about 81022.5056573789. The cubic root of 6564646423 is about 1872.4221924968.

The spelling of 6564646423 in words is "six billion, five hundred sixty-four million, six hundred forty-six thousand, four hundred twenty-three".