Answer
No degree.
Work Step by Step
The degree of a monomial is the sum of the exponents of its variables.
The degree of a nonzero constant is 0.
Zero has no degree.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.