663659 has 2 divisors, whose sum is σ = 663660. Its totient is φ = 663658.

The previous prime is 663653. The next prime is 663661. The reversal of 663659 is 956366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663659 - 2¹² = 659563 is a prime.

Together with 663661, 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 (663653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331829 + 331830.

It is an arithmetic number, because the mean of its divisors is an integer number (331830).

2⁶⁶³⁶⁵⁹ is an apocalyptic number.

663659 is a deficient number, since it is larger than the sum of its proper divisors (1).

663659 is an equidigital number, since it uses as much as digits as its factorization.

663659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 35.

The square root of 663659 is about 814.6526867322. The cubic root of 663659 is about 87.2264764732.

The spelling of 663659 in words is "six hundred sixty-three thousand, six hundred fifty-nine".