6688668866 has 16 divisors (see below), whose sum is σ = 11322512640. Its totient is φ = 2935465680.

The previous prime is 6688668851. The next prime is 6688668881.

6688668866 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (6688668851) and next prime (6688668881).

It is a super-3 number, since 3×6688668866³ (a number of 30 digits) contains 333 as substring.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6688668796 and 6688668805.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5241266 + ... + 5242541.

It is an arithmetic number, because the mean of its divisors is an integer number (707657040).

Almost surely, 2^6688668866 is an apocalyptic number.

6688668866 is a deficient number, since it is larger than the sum of its proper divisors (4633843774).

6688668866 is a wasteful number, since it uses less digits than its factorization.

6688668866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10483849.

The product of its digits is 191102976, while the sum is 68.

The square root of 6688668866 is about 81784.2825119839. The cubic root of 6688668866 is about 1884.1402703954.

The spelling of 6688668866 in words is "six billion, six hundred eighty-eight million, six hundred sixty-eight thousand, eight hundred sixty-six".