6566631566 has 16 divisors (see below), whose sum is σ = 10995291648. Its totient is φ = 2915417400.

The previous prime is 6566631521. The next prime is 6566631571. The reversal of 6566631566 is 6651366656.

It is a super-2 number, since 2×6566631566² = 86241300247175224712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 3469790 + ... + 3471681.

It is an arithmetic number, because the mean of its divisors is an integer number (687205728).

Almost surely, 2^6566631566 is an apocalyptic number.

6566631566 is a deficient number, since it is larger than the sum of its proper divisors (4428660082).

6566631566 is a wasteful number, since it uses less digits than its factorization.

6566631566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6941527.

The product of its digits is 3499200, while the sum is 50.

The square root of 6566631566 is about 81034.7552967244. The cubic root of 6566631566 is about 1872.6109130542.

The spelling of 6566631566 in words is "six billion, five hundred sixty-six million, six hundred thirty-one thousand, five hundred sixty-six".