255565 has 8 divisors (see below), whose sum is σ = 311040. Its totient is φ = 201552.
The previous prime is 255551. The next prime is 255571. The reversal of 255565 is 565552.
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 255565 - 29 = 255053 is a prime.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72 + ... + 718.
It is an arithmetic number, because the mean of its divisors is an integer number (38880).
2255565 is an apocalyptic number.
It is an amenable number.
255565 is a deficient number, since it is larger than the sum of its proper divisors (55475).
255565 is an equidigital number, since it uses as much as digits as its factorization.
255565 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 731.
The product of its digits is 7500, while the sum is 28.
The square root of 255565 is about 505.5343707405. The cubic root of 255565 is about 63.4600571338.
It can be divided in two parts, 255 and 565, that added together give a triangular number (820 = T40).
The spelling of 255565 in words is "two hundred fifty-five thousand, five hundred sixty-five".
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