6564444643 has 2 divisors, whose sum is σ = 6564444644. Its totient is φ = 6564444642.

The previous prime is 6564444619. The next prime is 6564444659. The reversal of 6564444643 is 3464444656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6564444643 - 2²⁵ = 6530890211 is a prime.

It is a super-2 number, since 2×6564444643² = 86183866942022794898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6564444593 and 6564444602.

It is not a weakly prime, because it can be changed into another prime (6564444673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282222321 + 3282222322.

It is an arithmetic number, because the mean of its divisors is an integer number (3282222322).

Almost surely, 2^6564444643 is an apocalyptic number.

6564444643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564444643 is an equidigital number, since it uses as much as digits as its factorization.

6564444643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 46.

The square root of 6564444643 is about 81021.2604382331. The cubic root of 6564444643 is about 1872.4030078525.

The spelling of 6564444643 in words is "six billion, five hundred sixty-four million, four hundred forty-four thousand, six hundred forty-three".