| Base | Representation |
|---|---|
| bin | 10010101110111001101… |
| … | …11011101000011000000 |
| 3 | 2021112101110122221010110 |
| 4 | 21113130313131003000 |
| 5 | 41021201321322040 |
| 6 | 1211405154231320 |
| 7 | 64334246523660 |
| oct | 11273467350300 |
| 9 | 2245343587113 |
| 10 | 643655651520 |
| 11 | 228a77920742 |
| 12 | a48b2b85540 |
| 13 | 489091a677b |
| 14 | 2322016a1a0 |
| 15 | 11b2275a980 |
| hex | 95dcddd0c0 |
643655651520 has 448 divisors, whose sum is σ = 2361950502912. Its totient is φ = 145466880000.
The previous prime is 643655651519. The next prime is 643655651549. The reversal of 643655651520 is 25156556346.
643655651520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a tau number, because it is divible by the number of its divisors (448).
It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.
It is a Harshad number since it is a multiple of its sum of digits (48).
It is a self number, because there is not a number n which added to its sum of digits gives 643655651520.
It is an unprimeable number.
It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 273778345 + ... + 273780695.
It is an arithmetic number, because the mean of its divisors is an integer number (5272210944).
Almost surely, 2643655651520 is an apocalyptic number.
643655651520 is a gapful number since it is divisible by the number (60) 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 643655651520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1180975251456).
643655651520 is an abundant number, since it is smaller than the sum of its proper divisors (1718294851392).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
643655651520 is a wasteful number, since it uses less digits than its factorization.
643655651520 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2820 (or 2810 counting only the distinct ones).
The product of its (nonzero) digits is 3240000, while the sum is 48.
The spelling of 643655651520 in words is "six hundred forty-three billion, six hundred fifty-five million, six hundred fifty-one thousand, five hundred twenty".
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