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I can not reproduce your problem:

sage: n = 2^160
sage: n
1461501637330902918203684832716283019655932542976
sage: n.parent()
Integer Ring
sage: n in ZZ
True

Could you please give us some informations so that someone can try to reproduce your problem:

• which version of Sage did you use ?
• which OS ?
• did you install Sage from the binaries, and which ones ?
• did you compile Sage yourself ?
• which notebook did you use (Sage notebook or jupyter notebook) ?
• did you use the command line ?
• which commands did you type precisely to get the error ?
• which error message did you get ?
• ... ?