6564646426 has 32 divisors (see below), whose sum is σ = 10726974720. Its totient is φ = 2994957504.

The previous prime is 6564646423. The next prime is 6564646447. The reversal of 6564646426 is 6246464656.

It is a self number, because there is not a number n which added to its sum of digits gives 6564646426.

It is not an unprimeable number, because it can be changed into a prime (6564646423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309641 + ... + 1314643.

It is an arithmetic number, because the mean of its divisors is an integer number (335217960).

Almost surely, 2^6564646426 is an apocalyptic number.

6564646426 is a deficient number, since it is larger than the sum of its proper divisors (4162328294).

6564646426 is a wasteful number, since it uses less digits than its factorization.

6564646426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5590.

The product of its digits is 4976640, while the sum is 49.

The square root of 6564646426 is about 81022.5056758923. The cubic root of 6564646426 is about 1872.4221927821.

The spelling of 6564646426 in words is "six billion, five hundred sixty-four million, six hundred forty-six thousand, four hundred twenty-six".