6655866868 has 24 divisors (see below), whose sum is σ = 13890506112. Its totient is φ = 2728491744.

The previous prime is 6655866851. The next prime is 6655866881. The reversal of 6655866868 is 8686685566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5166955 + ... + 5168242.

It is an arithmetic number, because the mean of its divisors is an integer number (578771088).

Almost surely, 2^6655866868 is an apocalyptic number.

It is an amenable number.

6655866868 is an abundant number, since it is smaller than the sum of its proper divisors (7234639244).

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

6655866868 is a wasteful number, since it uses less digits than its factorization.

6655866868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10335231 (or 10335229 counting only the distinct ones).

The product of its digits is 99532800, while the sum is 64.

The square root of 6655866868 is about 81583.4962967388. The cubic root of 6655866868 is about 1881.0552085109.

The spelling of 6655866868 in words is "six billion, six hundred fifty-five million, eight hundred sixty-six thousand, eight hundred sixty-eight".