6660566568 has 24 divisors (see below), whose sum is σ = 18039034650. Its totient is φ = 2220188832.

The previous prime is 6660566557. The next prime is 6660566569. The reversal of 6660566568 is 8656650666.

It can be written as a sum of positive squares in only one way, i.e., 5754436164 + 906130404 = 75858^2 + 30102^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (6660566569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46253863 + ... + 46254006.

Almost surely, 2^6660566568 is an apocalyptic number.

It is an amenable number.

6660566568 is an abundant number, since it is smaller than the sum of its proper divisors (11378468082).

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

6660566568 is a wasteful number, since it uses less digits than its factorization.

6660566568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92507881 (or 92507874 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 54.

The square root of 6660566568 is about 81612.2942209077. The cubic root of 6660566568 is about 1881.4978413251.

The spelling of 6660566568 in words is "six billion, six hundred sixty million, five hundred sixty-six thousand, five hundred sixty-eight".