数亿 (shù yì) is a compound numeral meaning 'several hundred million'. It combines 数 (shù, 'several') with 亿 (yì, 'hundred million') and is used to express large, approximate quantities. Note that the pinyin for this word should be shù yì, not shǔ; the POS is also incorrectly labeled as a measure word — it functions as a numeral or noun in context.