1809-66-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1809-66-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,8,0 and 9 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1809-66:
(6*1)+(5*8)+(4*0)+(3*9)+(2*6)+(1*6)=91
91 % 10 = 1
So 1809-66-1 is a valid CAS Registry Number.