1 quintuple = 0.625 octuple; 1 octuple = 1.6 quintuple
million ↔ one
billion ↔ one
billion ↔ thousand
million ↔ thousand
million ↔ billion
billion ↔ trillion
trillion ↔ one
crore ↔ million
lakh ↔ million
crore ↔ billion
lakh ↔ billion
crore ↔ one
lakh ↔ one