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One can convert this "long" to a "Sage integer", and use the method "bits".
sage: a = 189866136719308462018271159242437168532L
sage: b = ZZ(a).bits()
How many bits do we have:
sage: len(b)
128
Show the first eight bits
sage: b[:8]
[0, 0, 1, 0, 1, 0, 0, 1]
and the last eight bits
sage: b[-8:]
[0, 1, 1, 1, 0, 0, 0, 1]
