66663 has 10 divisors (see below), whose sum is σ = 99704. Its totient is φ = 44388.
The previous prime is 66653. The next prime is 66683. The reversal of 66663 is 36666.
66663 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.
It is a de Polignac number, because none of the positive numbers 2k-66663 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a Duffinian number.
It is a plaindrome in base 13.
It is a nialpdrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (66643) 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 9 ways as a sum of consecutive naturals, for example, 331 + ... + 492.
266663 is an apocalyptic number.
66663 is a deficient number, since it is larger than the sum of its proper divisors (33041).
66663 is an equidigital number, since it uses as much as digits as its factorization.
66663 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 835 (or 826 counting only the distinct ones).
The product of its digits is 3888, while the sum is 27.
The square root of 66663 is about 258.1917891801. The cubic root of 66663 is about 40.5472699099.
It can be divided in two parts, 666 and 63, that added together give a 6-th power (729 = 36).
The spelling of 66663 in words is "sixty-six thousand, six hundred sixty-three".
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