663589 has 2 divisors, whose sum is σ = 663590. Its totient is φ = 663588.

The previous prime is 663587. The next prime is 663599. The reversal of 663589 is 985366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 476100 + 187489 = 690^2 + 433^2 .

It is a cyclic number.

It is not a de Polignac number, because 663589 - 2¹ = 663587 is a prime.

Together with 663587, 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 (663581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331794 + 331795.

It is an arithmetic number, because the mean of its divisors is an integer number (331795).

2⁶⁶³⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

663589 is a deficient number, since it is larger than the sum of its proper divisors (1).

663589 is an equidigital number, since it uses as much as digits as its factorization.

663589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 663589 is about 814.6097225052. The cubic root of 663589 is about 87.2234096030.

It can be divided in two parts, 6635 and 89, that added together give a square (6724 = 82²).

The spelling of 663589 in words is "six hundred sixty-three thousand, five hundred eighty-nine".