| Base | Representation |
|---|---|
| bin | 111100010001101100… |
| … | …111011111010100000 |
| 3 | 20012001112220221200100 |
| 4 | 330101230323322200 |
| 5 | 2030022201024411 |
| 6 | 45422130222400 |
| 7 | 4450600455144 |
| oct | 742154737240 |
| 9 | 205045827610 |
| 10 | 64721501856 |
| 11 | 254a2667310 |
| 12 | 10663124a00 |
| 13 | 61459a8b7b |
| 14 | 31bd97b224 |
| 15 | 1a3bee6456 |
| hex | f11b3bea0 |
64721501856 has 288 divisors, whose sum is σ = 217787222016. Its totient is φ = 18008064000.
The previous prime is 64721501851. The next prime is 64721501861. The reversal of 64721501856 is 65810512746.
64721501856 is a `hidden beast` number, since 6 + 47 + 21 + 501 + 85 + 6 = 666.
It is an interprime number because it is at equal distance from previous prime (64721501851) and next prime (64721501861).
It is a tau number, because it is divible by the number of its divisors (288).
It is a super-3 number, since 3×647215018563 (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.
It is not an unprimeable number, because it can be changed into a prime (64721501851) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2193441 + ... + 2222751.
It is an arithmetic number, because the mean of its divisors is an integer number (756205632).
Almost surely, 264721501856 is an apocalyptic number.
64721501856 is a gapful number since it is divisible by the number (66) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 64721501856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108893611008).
64721501856 is an abundant number, since it is smaller than the sum of its proper divisors (153065720160).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
64721501856 is a wasteful number, since it uses less digits than its factorization.
64721501856 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 29396 (or 29385 counting only the distinct ones).
The product of its (nonzero) digits is 403200, while the sum is 45.
The spelling of 64721501856 in words is "sixty-four billion, seven hundred twenty-one million, five hundred one thousand, eight hundred fifty-six".
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