563665 has 8 divisors (see below), whose sum is σ = 685440. Its totient is φ = 444912.

The previous prime is 563663. The next prime is 563723. The reversal of 563665 is 566365.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 563665 - 2¹ = 563663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (563663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319 + ... + 1108.

It is an arithmetic number, because the mean of its divisors is an integer number (85680).

2⁵⁶³⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

563665 is a deficient number, since it is larger than the sum of its proper divisors (121775).

563665 is a wasteful number, since it uses less digits than its factorization.

563665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511.

The product of its digits is 16200, while the sum is 31.

The square root of 563665 is about 750.7762649418. The cubic root of 563665 is about 82.6051307426.

It can be divided in two parts, 56 and 3665, that added together give a square (3721 = 61²).

The spelling of 563665 in words is "five hundred sixty-three thousand, six hundred sixty-five".