<PAGE>
<TABLE>
<CAPTION>
<S> <C>
PROSPECTUS SUPPLEMENT FILE NO. 333-44173
(TO PROSPECTUS AND PROSPECTUS SUPPLEMENT DATED JULY 7, 1997) RULE 424(B)(3)
PROSPECTUS NUMBER: 1661
</TABLE>
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> <C> <C>
PRINCIPAL AMOUNT: $132,000,000 ORIGINAL ISSUE DATE: March 5, 1998
CUSIP NUMBER: 59018SB29 STATED MATURITY DATE: March 5, 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: One Month MINIMUM INTEREST RATE: Not Applicable
SPREAD: -0.050% MAXIMUM INTEREST RATE: Not Applicable
INITIAL INTEREST RATE: 5.6375% SPREAD MULTIPLIER: Not Applicable
INTEREST RESET DATES: Monthly
INTEREST PAYMENT DATES: The 5th of each month commencing April 1998 through the Maturity; 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 2, 1998
</TABLE>
