<PAGE>
                                                              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: 1644
                                     DATED: JANUARY 26, 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:                LIBOR
 
 
INDEX MATURITY:           1 month
 
 
TRADE DATE:               January 26, 1998
 
 
SETTLEMENT DATE:          January 29, 1998
 
 
MATURITY DATE:            January 29, 1999
 
 
REDEMPTION DATE:          N/A
 
 
OPTIONAL REPAYMENT DATES: N/A
 
 
SPREAD:                   -0.050%
                          (minus five basis points)
 
 
SPREAD MULTIPLIER:        N/A
 
 
COMMISSION:               0.075%
 
 
MAXIMUM INTEREST RATE:    N/A
 
 
MINIMUM INTEREST RATE:    N/A
 
 
INTEREST RESET DATES:     Monthly
 
 
INTEREST PAYMENT DATES:   Pays the 29th of each month, commencing February 27th to maturity,
                          subject to the modified following business day convention.
 
 
INITIAL INTEREST RATE:    5.57500%
 
 
FORM:                     Book-entry
 
 
</TABLE>
 
 
                                         CUSIP # 59018SZR8
                                         PRINCIPAL $150,000,000.00
 
 
 
 



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