How many digits make up a social security code

The order of arrangement, from left to right, is as follows: a six-digit address code, an eight-digit date of birth code, a three-digit sequential code, and a one-digit check code. Address code: indicates the code of the insured person in the province or municipality directly under the central government; date of birth code: indicates the birth date of the insured person; sequential code: indicates the sequential number of the person of the same gender in the same month of the same birth date in the same region; check code: consists of the numbers 0-9 and the letter X, which is randomly generated by the Social Security Administration and calculated by a certain algorithm.