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<S>                                                          <C>
 
PROSPECTUS SUPPLEMENT                                           FILE NO. 333-44173
(TO PROSPECTUS AND PROSPECTUS SUPPLEMENT DATED JULY 7, 1997)        RULE 424(B)(3)
PROSPECTUS NUMBER: 1664
 
 
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                           MERRILL LYNCH & CO., INC.
                          MEDIUM-TERM NOTES, SERIES B
                   DUE NINE MONTHS OR MORE FROM DATE OF ISSUE
                              FLOATING RATE NOTES
 
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<S>                     <C>                  <C>                                    <C>
 
PRINCIPAL AMOUNT:       $95,000,000               ORIGINAL ISSUE DATE:              March 9, 1998
 
 
CUSIP NUMBER:           59018SB52                 STATED MATURITY DATE:             March 9, 2000
 
 
INTEREST CALCULATION:                             DAY COUNT CONVENTION:
/x/ REGULAR FLOATING RATE NOTE                    /x/ ACTUAL/360
/ / INVERSE FLOATING RATE NOTE                    / / 30/360
(FIXED INTEREST RATE):                            / / ACTUAL/ACTUAL
 
 
INTEREST RATE BASIS:
/ / LIBOR                                         / / COMMERCIAL PAPER RATE
/ / CMT RATE                                      / / ELEVENTH DISTRICT COST OF FUNDS RATE
/ / PRIME RATE                                    / / CD RATE
/x/ FEDERAL FUNDS RATE                            / / OTHER (SEE ATTACHED)
/ / TREASURY RATE
DESIGNATED CMT PAGE:                              DESIGNATED LIBOR PAGE:
CMT TELERATE PAGE:                                LIBOR TELERATE PAGE:
CMT REUTERS PAGE:                                 LIBOR REUTERS PAGE:
 
 
INDEX MATURITY:         One Day                   MINIMUM INTEREST RATE:            Not Applicable
 
 
SPREAD:                 0.210%                    MAXIMUM INTEREST RATE:            Not Applicable
 
 
INITIAL INTEREST RATE:  TBD                       SPREAD MULTIPLIER:                Not Applicable
 
 
INTEREST RESET DATES:   Daily
 
 
INTEREST PAYMENT DATES: Quarterly on the 9th of June, September, December and March, commencing June 9, 1998,
                        through the maturity date; subject to modified 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 cannot be redeemed prior to the Stated Maturity Date.
 
 
FORM:                   The Notes are being issued in fully registered book-entry form.
 
 
TRUSTEE:                The Chase Manhattan Bank
 
 
DATED:                  March 5, 1998
 
 
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