54.
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59 and 53 are the two largest primes less than 60. 59+53 = 112
59
67 is greater than 59, but less than 59 and 72.
59*10= 590, 590 is less than 621
59 does not form the product of 9 and a positive integer, therefore, 59 is not an integer multiple of 9. 59/9 = 6.5 recurring (that is, 6.5555..)