66446 has 4 divisors (see below), whose sum is σ = 99672. Its totient is φ = 33222.
The previous prime is 66431. The next prime is 66449. The reversal of 66446 is 64466.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64466 = 2 ⋅32233.
It is a Curzon number.
It is a plaindrome in base 9.
It is a congruent number.
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 as a sum of consecutive naturals, namely, 16610 + ... + 16613.
It is an arithmetic number, because the mean of its divisors is an integer number (24918).
266446 is an apocalyptic number.
66446 is a deficient number, since it is larger than the sum of its proper divisors (33226).
66446 is a wasteful number, since it uses less digits than its factorization.
66446 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 33225.
The product of its digits is 3456, while the sum is 26.
The square root of 66446 is about 257.7712163916. The cubic root of 66446 is about 40.5032258773.
It can be divided in two parts, 66 and 446, that added together give a 9-th power (512 = 29).
The spelling of 66446 in words is "sixty-six thousand, four hundred forty-six".
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