566 can be written using four 4's:
See also 113
566 has 4
divisors (see below), whose sum is σ = 852
Its totient is φ = 282
The previous prime is 563. The next prime is 569. The reversal of 566 is 665.
It is a happy number.
566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It is an interprime number because it is at equal distance from previous prime (563) and next prime (569).
It is an Ulam number.
It is a plaindrome in base 9, base 10, base 13, base 15 and base 16.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (563) 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, 140 + ... + 143.
It is an arithmetic number, because the mean of its divisors is an integer number (213).
566 is a deficient number, since it is larger than the sum of its proper divisors (286).
566 is a wasteful number, since it uses less digits than its factorization.
566 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 285.
The product of its digits is 180, while the sum is 17.
The square root of 566 is about 23.7907545067.
The cubic root of 566 is about 8.2719038383.
Subtracting 566 from its reverse (665), we obtain a palindrome (99).
The spelling of 566 in words is "five hundred sixty-six", and thus it is an aban number and an oban number.