FILE NO. 333-28537
                                                                  RULE 424(B)(3)
 
                             PROSPECTUS SUPPLEMENT
                       (TO PROSPECTUS DATED JULY 7, 1997)
                 (TO PROSPECTUS SUPPLEMENT DATED JULY 7, 1997)
 
                                     PROSPECTUS NUMBER: 1640
                                     DATED: JANUARY 16, 1998
 
 
                           MERRILL LYNCH & CO., INC.
                          MEDIUM-TERM NOTES, SERIES B
                   DUE NINE MONTHS OR MORE FROM DATE OF ISSUE
                              FLOATING RATE NOTES
 
<TABLE>
<CAPTION>
 
<S>                       <C>
 
BASE RATE:                Fed Funds (Prior Day H.15)
 
 
INDEX MATURITY:           One Day
 
 
TRADE DATE:               January 16, 1998
 
 
SETTLEMENT DATE:          January 23, 1998
 
 
MATURITY DATE:            January 23, 2001
 
 
REDEMPTION DATE:          N/A
 
 
OPTIONAL REPAYMENT DATES: N/A
 
 
SPREAD:                   0.260%
                          (Plus twenty six bps)
 
 
SPREAD MULTIPLIER:        N/A
 
 
COMMISSION:               0.250%
 
 
MAXIMUM INTEREST RATE:    N/A
 
 
MINIMUM INTEREST RATE:    N/A
 
 
INTEREST RESET DATES:     Daily
 
 
INTEREST PAYMENT DATES:   The 23rd day of each January, April, July and October, commencing on
                          April 23, 1998 through and including the Maturity Date; subject to the
                          modified following business day convention.
 
 
INITIAL INTEREST RATE:    TBD
 
 
FORM:                     Book-entry
 
 
</TABLE>
 
 
                                         CUSIP # 58018SZM9
                                         PRINCIPAL $27,000,000.00