6689999866 has 8 divisors (see below), whose sum is σ = 10947272544. Its totient is φ = 3040909020.

The previous prime is 6689999839. The next prime is 6689999891.

6689999866 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6689999792 and 6689999801.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152045430 + ... + 152045473.

It is an arithmetic number, because the mean of its divisors is an integer number (1368409068).

Almost surely, 2^6689999866 is an apocalyptic number.

6689999866 is a deficient number, since it is larger than the sum of its proper divisors (4257272678).

6689999866 is a wasteful number, since it uses less digits than its factorization.

6689999866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304090916.

The product of its digits is 544195584, while the sum is 76.

The square root of 6689999866 is about 81792.4193675673. The cubic root of 6689999866 is about 1884.2652391759.

The spelling of 6689999866 in words is "six billion, six hundred eighty-nine million, nine hundred ninety-nine thousand, eight hundred sixty-six".