6688340066 has 4 divisors (see below), whose sum is σ = 10032510102. Its totient is φ = 3344170032.

The previous prime is 6688340063. The next prime is 6688340143. The reversal of 6688340066 is 6600438866.

6688340066 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6596850841 + 91489225 = 81221^2 + 9565^2 .

It is a super-3 number, since 3×6688340066³ (a number of 30 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6688340066.

It is not an unprimeable number, because it can be changed into a prime (6688340063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1672085015 + ... + 1672085018.

Almost surely, 2^6688340066 is an apocalyptic number.

6688340066 is a deficient number, since it is larger than the sum of its proper divisors (3344170036).

6688340066 is a wasteful number, since it uses less digits than its factorization.

6688340066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344170035.

The product of its (nonzero) digits is 995328, while the sum is 47.

The square root of 6688340066 is about 81782.2723210844. The cubic root of 6688340066 is about 1884.1093965158.

The spelling of 6688340066 in words is "six billion, six hundred eighty-eight million, three hundred forty thousand, sixty-six".