1657009-91-0 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1657009-91-0 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,5,7,0,0 and 9 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1657009-91:
(9*1)+(8*6)+(7*5)+(6*7)+(5*0)+(4*0)+(3*9)+(2*9)+(1*1)=180
180 % 10 = 0
So 1657009-91-0 is a valid CAS Registry Number.