6563634646 has 4 divisors (see below), whose sum is σ = 9845451972. Its totient is φ = 3281817322.

The previous prime is 6563634617. The next prime is 6563634653. The reversal of 6563634646 is 6464363656.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6563634646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1640908660 + ... + 1640908663.

It is an arithmetic number, because the mean of its divisors is an integer number (2461362993).

Almost surely, 2^6563634646 is an apocalyptic number.

6563634646 is a deficient number, since it is larger than the sum of its proper divisors (3281817326).

6563634646 is a wasteful number, since it uses less digits than its factorization.

6563634646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281817325.

The product of its digits is 5598720, while the sum is 49.

The square root of 6563634646 is about 81016.2616145672. The cubic root of 6563634646 is about 1872.3259917815.

The spelling of 6563634646 in words is "six billion, five hundred sixty-three million, six hundred thirty-four thousand, six hundred forty-six".