Good day,
Some Bible translators translate their number as:
(Rev 9:16 LEB) And the number of the troops of the cavalry was two hundred million; I heard the number of them.
or
(Rev 9:16 KJV) And the number of the army of the horsemen were two hundred thousand thousand: and I heard the number of them.
Others translate the verse literally as:
(Rev 9:16 LITV) And the number of the armies of the cavalry was two myriads of myriads; and I heard their number.
Their number or size could really be “two hundred million” because “two myriads of myriads” is two ten thousand times ten thousand but it could also be expressed as two (
groups or units of) myriads of myriads of horsemen.