67 or 71
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63 is not a prime number.
73 is a prime number, but 45 is not a prime number.
73 is a prime number
The prime numbers between 70 and 80 are 71, 73, and 79.
73:Is a prime numberIt is the 21st prime numberThe next prime number after 73 is 79The binary of 73 is 1001001The hexadecimal of 73 is 49