660559 has 2 divisors, whose sum is σ = 660560. Its totient is φ = 660558.

The previous prime is 660557. The next prime is 660563. The reversal of 660559 is 955066.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660559 - 2¹ = 660557 is a prime.

Together with 660557, it forms a pair of twin primes.

660559 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 660559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330279 + 330280.

It is an arithmetic number, because the mean of its divisors is an integer number (330280).

2⁶⁶⁰⁵⁵⁹ is an apocalyptic number.

660559 is a deficient number, since it is larger than the sum of its proper divisors (1).

660559 is an equidigital number, since it uses as much as digits as its factorization.

660559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 660559 is about 812.7478083637. The cubic root of 660559 is about 87.0904506951.

It can be divided in two parts, 66055 and 9, that multiplied together give a palindrome (594495).

The spelling of 660559 in words is "six hundred sixty thousand, five hundred fifty-nine".