663959 has 2 divisors, whose sum is σ = 663960. Its totient is φ = 663958.

The previous prime is 663937. The next prime is 663961. The reversal of 663959 is 959366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663959 - 2¹² = 659863 is a prime.

Together with 663961, 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 (663979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331979 + 331980.

It is an arithmetic number, because the mean of its divisors is an integer number (331980).

2⁶⁶³⁹⁵⁹ is an apocalyptic number.

663959 is a deficient number, since it is larger than the sum of its proper divisors (1).

663959 is an equidigital number, since it uses as much as digits as its factorization.

663959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 38.

The square root of 663959 is about 814.8367934746. The cubic root of 663959 is about 87.2396177606.

The spelling of 663959 in words is "six hundred sixty-three thousand, nine hundred fifty-nine".