From gbianchi's last post (he makes these regularly):

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block#  346488  06/03/2015               num  %noOut   %dead   %of tot %of act  diff prev           value  %noOut  %vdead   %TotVal       diff prev
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= 0                                 62633417   0.00%   0.00%  93.5626%             125855         0.00000   0.00%   0.00%   0.0000%         0.00000
= 1 satoshi (0.00000001 BTC)          424786  36.84%   8.43%   0.6346%   9.86%         15         0.00425  36.84%   8.43%   0.0000%         0.00000
> 1 satoshi <= 0.001 BTC  ( ~1$ )    1802268  75.19%  14.96%   2.6923%  41.82%       2132       418.44983  69.64%   4.39%   0.0030%         0.34730
> 0.001 BTC <= 0.1 BTC               1374072  68.02%   4.87%   2.0526%  31.89%      -3121     28932.13841  71.18%   7.27%   0.2080%       -90.78105
> 0.1 BTC <= 1 BTC                    393208  69.18%   5.30%   0.5874%   9.12%       -108    171729.77427  73.57%   7.08%   1.2346%         7.73250
> 1 BTC <= 5 BTC                      156615  68.06%   5.38%   0.2340%   3.63%        244    376669.06388  69.36%   5.75%   2.7080%       280.70164
> 5 BTC <= 10 BTC                      45309  70.22%   5.16%   0.0677%   1.05%        106    347625.01943  72.04%   5.23%   2.4992%       825.00472
> 10 BTC <= 25 BTC                     35885  68.78%   5.43%   0.0536%   0.83%         19    588449.97580  70.05%   5.65%   4.2306%        -2.61582
> 25 BTC <= 50 BTC                     52567  90.82%  69.66%   0.0785%   1.22%         -7   2412077.44158  92.88%  75.44%  17.3412%      -602.56042
> 50 BTC <= 75 BTC                      5551  68.15%  12.23%   0.0083%   0.13%         18    331829.18959  67.82%  11.08%   2.3856%      1162.22146
> 75 BTC <= 100 BTC                     7461  83.77%   5.31%   0.0111%   0.17%         -4    708187.78653  84.72%   5.32%   5.0914%      -358.06960
> 100 BTC <= 500 BTC                    8551  67.20%   3.67%   0.0128%   0.20%         34   1815418.40323  67.65%   2.76%  13.0516%     10706.88586
> 500 btc <= 1000 BTC                   1609  75.82%   0.00%   0.0024%   0.04%         -5   1120607.34554  75.88%   0.00%   8.0564%     -3944.97798
> 1000 BTC                              1476  74.53%   0.00%   0.0022%   0.03%         -3   6007584.24205  68.60%   0.00%  43.1904%     -4283.87542
                  Total Actives      4309358  68.39%  10.30%   6.4374% 100.00%       -680  13909528.83410  74.31%  14.61% 100.0000%      3700.01320
                  Total             66942775   4.40%   0.66% 100.0000%             125175  13909528.83410  74.31%  14.61% 100.0000%      3700.01320

                  Transactions      61630417                                        93869


num      : number of addresses in this range of balance
%noOut   : percentage of active addresses WITHOUT out operations
%dead    : percentage of active addresses with input and output operations prior to 2012
%of tot  : percentage of the TOTAL number addresses
%of act  : percentage of the number of addresses with balance > 0 (active)
diff prev: number variation compared to the previous table
%noOut   : % value transactions WITHOUT output ( % value of range)
%vdead   : % operations value prev 2012 ( % value of range))
%TotVal  : % value of this range compared to the total value
diff prev: change in value compared to the previous table

donations : 17ykWbCHG6eMfLt42zCJVw5bZE1YxRMihL
So, there's about 23K addresses with > 50 BTC. You're in rare company.
arbedout

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