FILE NO. 333-44173
                                                                  RULE 424(B)(3)
 
                             PROSPECTUS SUPPLEMENT
          (TO PROSPECTUS AND PROSPECTUS SUPPLEMENT DATED JULY 7, 1997)
 
                                     PROSPECTUS NUMBER: 1645
 
 
 
                           MERRILL LYNCH & CO., INC.
                          MEDIUM-TERM NOTES, SERIES B
                   DUE NINE MONTHS OR MORE FROM DATE OF ISSUE
                           CALLABLE FIXED RATE NOTES
 
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<S>                      <C>
 
PRINCIPAL AMOUNT:        $25,000,000
 
 
CUSIP NUMBER:            59018 ZS6
 
 
INTEREST RATE:           6.42000%
 
 
ORIGINAL ISSUE DATE:     February 12, 1998
 
 
STATED MATURITY DATE:    February 12, 2008
 
 
INTEREST PAYMENT DATES:  12th day of each February and August, commencing on April 12, 1998 through
                         and including the Stated Maturity Date, subject to the following business
                         day convention.
 
 
REPAYMENT AT THE OPTION
OF THE HOLDER:           The Notes cannot be repaid prior to the Stated Maturity Date.
 
 
REDEMPTION AT THE OPTION
OF THE COMPANY:          The Notes may be redeemed prior to the Stated Maturity Date, See "Other
                         Provisions"
 
 
INITIAL REDEMPTION DATE: February 12, 2001
 
 
OTHER PROVISIONS:        This Note is subject to redemption at the option of the Company, in whole,
                         on any Interest Payment Date occuring in February or August commencing on or
                         after the Interest Payment Date in February 2001, (the "Redemption Date") at
                         the Redemption Price (as defined below) together with interest thereon
                         payable to the Redemption Date, on notice given, not more than 60 nor less
                         than 30 days prior to the Redemption Date. The Redemption Price with respect
                         to this Note shall be 100% of the principal amount of the Notes.
 
 
 
FORM:                    The Notes are being issued in fully registered book-entry form.
 
 
TRUSTEE:                 The Chase Manhattan Bank
 
 
DATED:                   January 29, 1998
 
 
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