66443 has 8 divisors (see below), whose sum is σ = 75600.
Its totient is φ = 57888.
The previous prime is 66431. The next prime is 66449. The reversal of 66443 is 34466.
Adding to 66443 its sum of digits (23), we get a palindrome (66466).
It can be divided in two parts, 664 and 43, that added together give a palindrome (707).
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 66443 - 210 = 65419 is a prime.
It is an Ulam number.
It is a d-powerful number, because it can be written as 62 + 66 + 4 + 43 + 39 .
It is a Duffinian number.
It is a plaindrome in base 9.
It is a nialpdrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (66449) 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 7 ways as a sum of consecutive naturals, for example, 113 + ... + 381.
It is an arithmetic number, because the mean of its divisors is an integer number (9450).
266443 is an apocalyptic number.
66443 is a deficient number, since it is larger than the sum of its proper divisors (9157).
66443 is a wasteful number, since it uses less digits than its factorization.
66443 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 301.
The product of its digits is 1728, while the sum is 23.
The square root of 66443 is about 257.7653972123.
The cubic root of 66443 is about 40.5026163020.
The spelling of 66443 in words is "sixty-six thousand, four hundred forty-three".