6643202689 has 2 divisors, whose sum is σ = 6643202690. Its totient is φ = 6643202688.

The previous prime is 6643202669. The next prime is 6643202717. The reversal of 6643202689 is 9862023466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3611048464 + 3032154225 = 60092^2 + 55065^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643202689 - 2²⁵ = 6609648257 is a prime.

It is not a weakly prime, because it can be changed into another prime (6643202669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321601344 + 3321601345.

It is an arithmetic number, because the mean of its divisors is an integer number (3321601345).

Almost surely, 2^6643202689 is an apocalyptic number.

It is an amenable number.

6643202689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643202689 is an equidigital number, since it uses as much as digits as its factorization.

6643202689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 46.

The square root of 6643202689 is about 81505.8445082314. The cubic root of 6643202689 is about 1879.8614173726.

The spelling of 6643202689 in words is "six billion, six hundred forty-three million, two hundred two thousand, six hundred eighty-nine".