663436589 has 2 divisors, whose sum is σ = 663436590. Its totient is φ = 663436588.

The previous prime is 663436561. The next prime is 663436591. The reversal of 663436589 is 985634366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 598634089 + 64802500 = 24467^2 + 8050^2 .

It is a cyclic number.

It is not a de Polignac number, because 663436589 - 2¹⁶ = 663371053 is a prime.

Together with 663436591, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663436519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331718294 + 331718295.

It is an arithmetic number, because the mean of its divisors is an integer number (331718295).

Almost surely, 2^663436589 is an apocalyptic number.

It is an amenable number.

663436589 is a deficient number, since it is larger than the sum of its proper divisors (1).

663436589 is an equidigital number, since it uses as much as digits as its factorization.

663436589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 50.

The square root of 663436589 is about 25757.2628398283. The cubic root of 663436589 is about 872.1673136045.

The spelling of 663436589 in words is "six hundred sixty-three million, four hundred thirty-six thousand, five hundred eighty-nine".