6686446866 has 16 divisors (see below), whose sum is σ = 14588611488. Its totient is φ = 2026196000.

The previous prime is 6686446861. The next prime is 6686446867.

It is a happy number.

6686446866 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (6686446861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50654835 + ... + 50654966.

It is an arithmetic number, because the mean of its divisors is an integer number (911788218).

Almost surely, 2^6686446866 is an apocalyptic number.

6686446866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6686446866 is an abundant number, since it is smaller than the sum of its proper divisors (7902164622).

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

6686446866 is a wasteful number, since it uses less digits than its factorization.

6686446866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101309817.

The product of its digits is 47775744, while the sum is 60.

The square root of 6686446866 is about 81770.6968662980. The cubic root of 6686446866 is about 1883.9316078824.

The spelling of 6686446866 in words is "six billion, six hundred eighty-six million, four hundred forty-six thousand, eight hundred sixty-six".