6688998866 has 32 divisors (see below), whose sum is σ = 11039293440. Its totient is φ = 3014499600.

The previous prime is 6688998791. The next prime is 6688998871.

6688998866 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6688998793 and 6688998802.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4497575 + ... + 4499061.

It is an arithmetic number, because the mean of its divisors is an integer number (344977920).

Almost surely, 2^6688998866 is an apocalyptic number.

6688998866 is a deficient number, since it is larger than the sum of its proper divisors (4350294574).

6688998866 is a wasteful number, since it uses less digits than its factorization.

6688998866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110.

The product of its digits is 429981696, while the sum is 74.

The square root of 6688998866 is about 81786.2999896682. The cubic root of 6688998866 is about 1884.1712559361.

The spelling of 6688998866 in words is "six billion, six hundred eighty-eight million, nine hundred ninety-eight thousand, eight hundred sixty-six".