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66321 = 327369
BaseRepresentation
bin10000001100010001
310100222100
4100030101
54110241
61231013
7364233
oct201421
9110870
1066321
1145912
1232469
1324258
141a253
15149b6
hex10311

66321 has 6 divisors (see below), whose sum is σ = 95810. Its totient is φ = 44208.

The previous prime is 66301. The next prime is 66337. The reversal of 66321 is 12366.

It is a happy number.

66321 is a `hidden beast` number, since 663 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 65025 + 1296 = 255^2 + 36^2 .

It is not a de Polignac number, because 66321 - 29 = 65809 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66294 and 66303.

It is not an unprimeable number, because it can be changed into a prime (66301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3676 + ... + 3693.

266321 is an apocalyptic number.

It is an amenable number.

66321 is a deficient number, since it is larger than the sum of its proper divisors (29489).

66321 is a wasteful number, since it uses less digits than its factorization.

66321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7375 (or 7372 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 66321 is about 257.5286391841. The cubic root of 66321 is about 40.4778113483.

Adding to 66321 its reverse (12366), we get a palindrome (78687).

The spelling of 66321 in words is "sixty-six thousand, three hundred twenty-one".

Divisors: 1 3 9 7369 22107 66321