663539 has 2 divisors, whose sum is σ = 663540. Its totient is φ = 663538.

The previous prime is 663529. The next prime is 663541. The reversal of 663539 is 935366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663539 - 2⁸ = 663283 is a prime.

Together with 663541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (663529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331769 + 331770.

It is an arithmetic number, because the mean of its divisors is an integer number (331770).

2⁶⁶³⁵³⁹ is an apocalyptic number.

663539 is a deficient number, since it is larger than the sum of its proper divisors (1).

663539 is an equidigital number, since it uses as much as digits as its factorization.

663539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 32.

The square root of 663539 is about 814.5790323842. The cubic root of 663539 is about 87.2212188494.

The spelling of 663539 in words is "six hundred sixty-three thousand, five hundred thirty-nine".