How to give data in hex to integer from string

sir i just want to give data to integer 64 from a string
please tell how can i give the string data to integer 64 just as is shown in example
my hex string data =0AB12985FFDC67
now i want this value in integer 64 as follow
intger64 = 0x0AB12985FFDC67
now to how can convert hex string data to integer64 and vice versa

UnpackString
and
PackInt64IntoString

You can find the info on these here:

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