def METHOD_NAME(reviews):
    """Builds a dictionary containing the number of reviews and the list of unique reviewers."""
    result = dict()
    result["review_number"] = reviews.totalCount
    reviewers = set()
    for review in reviews:
        if review.user:
            reviewers.add(review.user.login)
    result["unique_reviewers"] = list(reviewers)
    return result