66563 has 8 divisors (see below), whose sum is σ = 78432.
Its totient is φ = 55296.
The previous prime is 66553. The next prime is 66569. The reversal of 66563 is 36566.
It is a Cunningham number, because it is equal to 2582-1.
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 66563 - 26 = 66499 is a prime.
It is a Duffinian number.
It is a plaindrome in base 9.
It is not an unprimeable number, because it can be changed into a prime (66569) 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, 131 + ... + 387.
It is an arithmetic number, because the mean of its divisors is an integer number (9804).
266563 is an apocalyptic number.
66563 is a deficient number, since it is larger than the sum of its proper divisors (11869).
66563 is a wasteful number, since it uses less digits than its factorization.
66563 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 301.
The product of its digits is 3240, while the sum is 26.
The square root of 66563 is about 257.9980620082.
The cubic root of 66563 is about 40.5269850135.
The spelling of 66563 in words is "sixty-six thousand, five hundred sixty-three".