6689669866 has 8 divisors (see below), whose sum is σ = 10946732544. Its totient is φ = 3040759020.

The previous prime is 6689669851. The next prime is 6689669867.

6689669866 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 = 6689669795 and 6689669804.

It is not an unprimeable number, because it can be changed into a prime (6689669867) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 152037930 + ... + 152037973.

It is an arithmetic number, because the mean of its divisors is an integer number (1368341568).

Almost surely, 2^6689669866 is an apocalyptic number.

6689669866 is a deficient number, since it is larger than the sum of its proper divisors (4257062678).

6689669866 is a wasteful number, since it uses less digits than its factorization.

6689669866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304075916.

The product of its digits is 241864704, while the sum is 70.

The square root of 6689669866 is about 81790.4020408263. The cubic root of 6689669866 is about 1884.2342567262.

The spelling of 6689669866 in words is "six billion, six hundred eighty-nine million, six hundred sixty-nine thousand, eight hundred sixty-six".