6688360109 has 2 divisors, whose sum is σ = 6688360110. Its totient is φ = 6688360108.

The previous prime is 6688360097. The next prime is 6688360117. The reversal of 6688360109 is 9010638866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4066612900 + 2621747209 = 63770^2 + 51203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6688360109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6688368109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344180054 + 3344180055.

It is an arithmetic number, because the mean of its divisors is an integer number (3344180055).

Almost surely, 2^6688360109 is an apocalyptic number.

It is an amenable number.

6688360109 is a deficient number, since it is larger than the sum of its proper divisors (1).

6688360109 is an equidigital number, since it uses as much as digits as its factorization.

6688360109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 6688360109 is about 81782.3948597741. The cubic root of 6688360109 is about 1884.1112785556. Note that the first 3 decimals are identical.

The spelling of 6688360109 in words is "six billion, six hundred eighty-eight million, three hundred sixty thousand, one hundred nine".