63565 has 4 divisors (see below), whose sum is σ = 76284. Its totient is φ = 50848.

The previous prime is 63559. The next prime is 63577. The reversal of 63565 is 56536.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44521 + 19044 = 211^2 + 138^2 .

It is a cyclic number.

It is not a de Polignac number, because 63565 - 2⁵ = 63533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6352 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (19071).

2⁶³⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

63565 is a deficient number, since it is larger than the sum of its proper divisors (12719).

63565 is a wasteful number, since it uses less digits than its factorization.

63565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12718.

The product of its digits is 2700, while the sum is 25.

The square root of 63565 is about 252.1210026951. The cubic root of 63565 is about 39.9091688989.

The spelling of 63565 in words is "sixty-three thousand, five hundred sixty-five".