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A square number has an odd number of factors, but a number with an odd number of factor pairs is nothing special.
10 and 9, 12 and 1
They are called multiplicative inverses or reciprocals of each other.
its a factor with two pairs of the same number
The number is: 36725918 In descending order that is: 98765321 The pairs of numbers that have as many digits between them in both are: 3,9 5,8 6,7 So there are three pairs.