6563805664 has 48 divisors (see below), whose sum is σ = 14648996880. Its totient is φ = 2870000640.

The previous prime is 6563805653. The next prime is 6563805719. The reversal of 6563805664 is 4665083656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407317 + ... + 423124.

It is an arithmetic number, because the mean of its divisors is an integer number (305187435).

Almost surely, 2^6563805664 is an apocalyptic number.

It is an amenable number.

6563805664 is an abundant number, since it is smaller than the sum of its proper divisors (8085191216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6563805664 is a wasteful number, since it uses less digits than its factorization.

6563805664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830483 (or 830475 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 49.

The square root of 6563805664 is about 81017.3170624651. The cubic root of 6563805664 is about 1872.3422530291.

The spelling of 6563805664 in words is "six billion, five hundred sixty-three million, eight hundred five thousand, six hundred sixty-four".