66855 has 8 divisors (see below), whose sum is σ = 106992. Its totient is φ = 35648.
The previous prime is 66853. The next prime is 66863. The reversal of 66855 is 55866.
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 66855 - 21 = 66853 is a prime.
It is a plaindrome in base 13.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (66851) 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, 2214 + ... + 2243.
It is an arithmetic number, because the mean of its divisors is an integer number (13374).
266855 is an apocalyptic number.
66855 is a deficient number, since it is larger than the sum of its proper divisors (40137).
66855 is a wasteful number, since it uses less digits than its factorization.
66855 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4465.
The product of its digits is 7200, while the sum is 30.
The square root of 66855 is about 258.5633384685. The cubic root of 66855 is about 40.5861601173.
The spelling of 66855 in words is "sixty-six thousand, eight hundred fifty-five".
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