6564444655 has 8 divisors (see below), whose sum is σ = 7879055184. Its totient is φ = 5250408000.

The previous prime is 6564444643. The next prime is 6564444659. The reversal of 6564444655 is 5564444656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6564444655 - 2⁷ = 6564444527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6564444599 and 6564444608.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117886 + ... + 164395.

It is an arithmetic number, because the mean of its divisors is an integer number (984881898).

Almost surely, 2^6564444655 is an apocalyptic number.

6564444655 is a deficient number, since it is larger than the sum of its proper divisors (1314610529).

6564444655 is a wasteful number, since it uses less digits than its factorization.

6564444655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286937.

The product of its digits is 6912000, while the sum is 49.

The square root of 6564444655 is about 81021.2605122878. The cubic root of 6564444655 is about 1872.4030089934.

Subtracting from 6564444655 its reverse (5564444656), we obtain a palindrome (999999999).

The spelling of 6564444655 in words is "six billion, five hundred sixty-four million, four hundred forty-four thousand, six hundred fifty-five".