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Here is an other possibility:
sage: import random
sage: random.getrandbits(167)
96541868459945240442714629364038017535847363449131L
sage: ZZ(_)
96541868459945240442714629364038017535847363449131
sage: len(str(_))
50
(Well, $51$ decimal digits will also occur... I hope this is not an issue in the further application.)
