6668345689 has 2 divisors, whose sum is σ = 6668345690. Its totient is φ = 6668345688.

The previous prime is 6668345669. The next prime is 6668345699. The reversal of 6668345689 is 9865438666.

6668345689 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4777574400 + 1890771289 = 69120^2 + 43483^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668345689 - 2⁷ = 6668345561 is a prime.

It is not a weakly prime, because it can be changed into another prime (6668345639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334172844 + 3334172845.

It is an arithmetic number, because the mean of its divisors is an integer number (3334172845).

Almost surely, 2^6668345689 is an apocalyptic number.

It is an amenable number.

6668345689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668345689 is an equidigital number, since it uses as much as digits as its factorization.

6668345689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44789760, while the sum is 61.

The square root of 6668345689 is about 81659.9393154318. The cubic root of 6668345689 is about 1882.2300465504.

The spelling of 6668345689 in words is "six billion, six hundred sixty-eight million, three hundred forty-five thousand, six hundred eighty-nine".