6563644651 has 2 divisors, whose sum is σ = 6563644652. Its totient is φ = 6563644650.

The previous prime is 6563644627. The next prime is 6563644667. The reversal of 6563644651 is 1564463656.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6563644651 - 2⁷ = 6563644523 is a prime.

It is a super-2 number, since 2×6563644651² = 86162862209201823602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6563644691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3281822325 + 3281822326.

It is an arithmetic number, because the mean of its divisors is an integer number (3281822326).

Almost surely, 2^6563644651 is an apocalyptic number.

6563644651 is a deficient number, since it is larger than the sum of its proper divisors (1).

6563644651 is an equidigital number, since it uses as much as digits as its factorization.

6563644651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 46.

The square root of 6563644651 is about 81016.3233614066. The cubic root of 6563644651 is about 1872.3269431147.

The spelling of 6563644651 in words is "six billion, five hundred sixty-three million, six hundred forty-four thousand, six hundred fifty-one".