663569 has 2 divisors, whose sum is σ = 663570. Its totient is φ = 663568.

The previous prime is 663563. The next prime is 663571. The reversal of 663569 is 965366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 659344 + 4225 = 812^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 663569 - 2¹² = 659473 is a prime.

It is a super-2 number, since 2×663569² = 880647635522, which contains 22 as substring.

Together with 663571, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 663569.

It is not a weakly prime, because it can be changed into another prime (663563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331784 + 331785.

It is an arithmetic number, because the mean of its divisors is an integer number (331785).

2⁶⁶³⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

663569 is a deficient number, since it is larger than the sum of its proper divisors (1).

663569 is an equidigital number, since it uses as much as digits as its factorization.

663569 is an odious number, because the sum of its binary digits is odd.

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

The square root of 663569 is about 814.5974465956. The cubic root of 663569 is about 87.2225333148. Note that the first 3 decimals are identical.

The spelling of 663569 in words is "six hundred sixty-three thousand, five hundred sixty-nine".