6563993656 has 32 divisors (see below), whose sum is σ = 13474871280. Its totient is φ = 2972851200.

The previous prime is 6563993651. The next prime is 6563993671.

6563993656 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6563993656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6563993651) 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, 110265 + ... + 159016.

Almost surely, 2^6563993656 is an apocalyptic number.

It is an amenable number.

6563993656 is an abundant number, since it is smaller than the sum of its proper divisors (6910877624).

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

6563993656 is a wasteful number, since it uses less digits than its factorization.

6563993656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269575 (or 269571 counting only the distinct ones).

The product of its digits is 23619600, while the sum is 58.

The square root of 6563993656 is about 81018.4772505630. The cubic root of 6563993656 is about 1872.3601279238.

The spelling of 6563993656 in words is "six billion, five hundred sixty-three million, nine hundred ninety-three thousand, six hundred fifty-six".