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: 1616
                                     DATED: DECEMBER 2, 1997
 
                           MERRILL LYNCH & CO., INC.
                          MEDIUM-TERM NOTES, SERIES B
                   DUE NINE MONTHS OR MORE FROM DATE OF ISSUE
                    CONSTANT MATURITY TREASURY INDEXED NOTES
 
<TABLE>
<CAPTION>
 
<S>                       <C>                    <C>                   <C>
 
PRINCIPAL AMOUNT:         $100 Million           INTEREST RESET DATES: Each Interest Payment Date
                                                                       up to and including
                                                                       December 5, 2000
 
 
ORIGINAL ISSUE DATE:      December 5, 1997       INTEREST RATE BASIS:  Constant Maturity
                                                                       Treasury Rate
 
 
MATURITY DATE:            December 5, 2000       DESIGNATED CMT
                                                 MATURITY INDEX:       Two-year
 
 
REDEMPTION DATE:          Not Applicable         SPREAD:               +.25%
                                                                       (plus twenty-five bps)
 
 
OPTIONAL REPAYMENT DATES: Not Applicable         DESIGNATED CMT
                                                 TELERATE PAGE:        7051
 
 
INTEREST PAYMENT DATES:   Each March 5, June 5,
                          September 5, and
                          December 5,
                          commencing
                          March 5, 1998
 
 
</TABLE>
 
                            DESCRIPTION OF THE NOTES
 
GENERAL
 
     The Medium-Term Notes, Series B of Merrill Lynch & Co., Inc. (the
"Company"), offered hereby are "Constant Maturity Treasury Rate Indexed Notes"
and are referred to in this Prospectus Supplement as the "Notes". The Notes are
Regular Floating Rate Notes and certain provisions of the Notes are more fully
described in the accompanying Prospectus and Prospectus Supplement.
 
     This Prospectus Supplement relates to $100,000,000 aggregate principal
amount of Notes which the Company has agreed to sell to Merrill Lynch, Pierce,
Fenner & Smith Incorporated (the "Underwriter"), and which the Underwriter has
agreed to purchase from the Company, at a price of 99.75% of the principal
amount thereof. The Underwriter has advised the Company that it proposes
initially to offer the Notes to the public at a public offering price equal to
100% of the principal amount thereof. After the initial public offering price,
such public offering price may be changed.
 
     The Notes will not be subject to redemption by the Company in whole or in
part prior to the Maturity Date.
 
INTEREST
 
     The Notes will bear interest from and including December 5, 1997 to but
excluding the Maturity Date. Interest will be payable on the Interest Payment
Dates specified above. The interest rate will be reset on each Interest Reset
Date specified above to a per annum rate equal to the Constant Maturity Treasury
Rate (as defined herein) plus 0.25%, as determined by Merrill Lynch Capital
Services, Inc. (the "Calculation Agent"), a subsidiary of the Company; provided,
however, that the per annum rate of interest payable on the Notes for the period
from and including December 5, 1997 to but excluding March 5, 1998 will be
calculated by using December 3, 1997 as the relevant Interest Determination
Date. The "Interest Determination Date" pertaining to a Reset Date will be the
second Business Day preceding such Interest Reset Date.
 
     Interest on the Notes will be computed on the basis of a 360-day year of
twelve 30-day months.
 
          The date of this Prospectus Supplement is December 5, 1997.