6563664399 has 16 divisors (see below), whose sum is σ = 9612691200. Its totient is φ = 3965233536.

The previous prime is 6563664377. The next prime is 6563664421. The reversal of 6563664399 is 9934663656.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6563664377) and next prime (6563664421).

It is not a de Polignac number, because 6563664399 - 2⁷ = 6563664271 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6563664329) 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, 2501994 + ... + 2504615.

It is an arithmetic number, because the mean of its divisors is an integer number (600793200).

Almost surely, 2^6563664399 is an apocalyptic number.

6563664399 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

6563664399 is a deficient number, since it is larger than the sum of its proper divisors (3049026801).

6563664399 is a wasteful number, since it uses less digits than its factorization.

6563664399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5006654.

The product of its digits is 18895680, while the sum is 57.

The square root of 6563664399 is about 81016.4452379886. The cubic root of 6563664399 is about 1872.3288208660.

The spelling of 6563664399 in words is "six billion, five hundred sixty-three million, six hundred sixty-four thousand, three hundred ninety-nine".