655563 has 4 divisors (see below), whose sum is σ = 874088. Its totient is φ = 437040.

The previous prime is 655561. The next prime is 655579. The reversal of 655563 is 365556.

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

It is not a de Polignac number, because 655563 - 2¹ = 655561 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655563.

It is not an unprimeable number, because it can be changed into a prime (655561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109258 + ... + 109263.

It is an arithmetic number, because the mean of its divisors is an integer number (218522).

2⁶⁵⁵⁵⁶³ is an apocalyptic number.

655563 is a deficient number, since it is larger than the sum of its proper divisors (218525).

655563 is a wasteful number, since it uses less digits than its factorization.

655563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218524.

The product of its digits is 13500, while the sum is 30.

The square root of 655563 is about 809.6684506636. The cubic root of 655563 is about 86.8703313400.

The spelling of 655563 in words is "six hundred fifty-five thousand, five hundred sixty-three".