667559 has 2 divisors, whose sum is σ = 667560. Its totient is φ = 667558.

The previous prime is 667553. The next prime is 667561. The reversal of 667559 is 955766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667559 - 2¹² = 663463 is a prime.

Together with 667561, 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 (667553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333779 + 333780.

It is an arithmetic number, because the mean of its divisors is an integer number (333780).

2⁶⁶⁷⁵⁵⁹ is an apocalyptic number.

667559 is a deficient number, since it is larger than the sum of its proper divisors (1).

667559 is an equidigital number, since it uses as much as digits as its factorization.

667559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 38.

The square root of 667559 is about 817.0428385342. The cubic root of 667559 is about 87.3970053450.

It can be divided in two parts, 66 and 7559, that multiplied together give a palindrome (498894).

The spelling of 667559 in words is "six hundred sixty-seven thousand, five hundred fifty-nine".