6564444653 has 32 divisors (see below), whose sum is σ = 7516992000. Its totient is φ = 5682700800.

The previous prime is 6564444643. The next prime is 6564444659. The reversal of 6564444653 is 3564444656.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6564444653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6564444598 and 6564444607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6564444659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18809123 + ... + 18809471.

It is an arithmetic number, because the mean of its divisors is an integer number (234906000).

Almost surely, 2^6564444653 is an apocalyptic number.

It is an amenable number.

6564444653 is a deficient number, since it is larger than the sum of its proper divisors (952547347).

6564444653 is a wasteful number, since it uses less digits than its factorization.

6564444653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933.

The product of its digits is 4147200, while the sum is 47.

The square root of 6564444653 is about 81021.2604999453. The cubic root of 6564444653 is about 1872.4030088032.

The spelling of 6564444653 in words is "six billion, five hundred sixty-four million, four hundred forty-four thousand, six hundred fifty-three".