<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: 1636
DATED: JANUARY 14, 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: Prime (Prior Day H.15)
INDEX MATURITY: One Day
TRADE DATE: January 14, 1998
SETTLEMENT DATE: January 20, 1998
MATURITY DATE: January 20, 1999
REDEMPTION DATE: N/A
OPTIONAL REPAYMENT DATES: N/A
SPREAD: -2.880% (minus two hundred eighty two bps)
SPREAD MULTIPLIER: N/A
COMMISSION: 0.075%
MAXIMUM INTEREST RATE: N/A
MINIMUM INTEREST RATE: N/A
INTEREST RESET DATES: Daily
INTEREST PAYMENT DATES: 4/20/98, 7/20/98, 10/20/98 and Maturity, subject to Following Business
Day Convention.
INITIAL INTEREST RATE: TBD, 1/20/98
FORM: Book-entry
</TABLE>
CUSIP # 59018SZK3
PRINCIPAL $150,000,000.00