6688632589 has 2 divisors, whose sum is σ = 6688632590. Its totient is φ = 6688632588.

The previous prime is 6688632497. The next prime is 6688632593. The reversal of 6688632589 is 9852368866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5053077225 + 1635555364 = 71085^2 + 40442^2 .

It is a cyclic number.

It is not a de Polignac number, because 6688632589 - 2²³ = 6680243981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6688630589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344316294 + 3344316295.

It is an arithmetic number, because the mean of its divisors is an integer number (3344316295).

Almost surely, 2^6688632589 is an apocalyptic number.

It is an amenable number.

6688632589 is a deficient number, since it is larger than the sum of its proper divisors (1).

6688632589 is an equidigital number, since it uses as much as digits as its factorization.

6688632589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29859840, while the sum is 61.

The square root of 6688632589 is about 81784.0607270145. The cubic root of 6688632589 is about 1884.1368640833.

The spelling of 6688632589 in words is "six billion, six hundred eighty-eight million, six hundred thirty-two thousand, five hundred eighty-nine".