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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: 1665
 
 
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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:       $200,000,000              ORIGINAL ISSUE DATE:             March 12, 1998
 
 
CUSIP NUMBER:           59018SB60                 STATED MATURITY DATE:            April 6, 1999
 
 
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:
/x/ LIBOR                                         / / COMMERCIAL PAPER RATE
/ / CMT RATE                                      / / ELEVENTH DISTRICT COST OF FUNDS RATE
/ / PRIME RATE                                    / / CD RATE
/ / FEDERAL FUNDS RATE                            / / OTHER (SEE ATTACHED)
/ / TREASURY RATE
DESIGNATED CMT PAGE:                              DESIGNATED LIBOR PAGE:
CMT TELERATE PAGE:                                LIBOR TELERATE PAGE: 3750
CMT REUTERS PAGE:                                 LIBOR REUTERS PAGE:
 
 
INDEX MATURITY:         Three Months              MINIMUM INTEREST RATE:           Not Applicable
 
 
SPREAD:                 -0.070%                   MAXIMUM INTEREST RATE:           Not Applicable
 
 
INITIAL INTEREST RATE:  5.6175%                     SPREAD MULTIPLIER:               Not Applicable
 
 
INTEREST RESET DATES:   Quarterly
 
 
INTEREST PAYMENT DATES: 7/6/98, 10/6/98, 1/6/99 and 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 9, 1998
 
 
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