| Base | Representation |
|---|---|
| bin | 111101010010111011… |
| … | …011000011110000000 |
| 3 | 20021212211001110022210 |
| 4 | 331102323120132000 |
| 5 | 2034242321322442 |
| 6 | 50122501102120 |
| 7 | 4516656064533 |
| oct | 752273303600 |
| 9 | 207784043283 |
| 10 | 65815807872 |
| 11 | 25a04342651 |
| 12 | 109096b7940 |
| 13 | 628b614c19 |
| 14 | 3285036a1a |
| 15 | 1aa310519c |
| hex | f52ed8780 |
65815807872 has 128 divisors (see below), whose sum is σ = 192026016000. Its totient is φ = 19880239104.
The previous prime is 65815807867. The next prime is 65815807877. The reversal of 65815807872 is 27870851856.
65815807872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is an interprime number because it is at equal distance from previous prime (65815807867) and next prime (65815807877).
It is a tau number, because it is divible by the number of its divisors (128).
It is a Smith number, since the sum of its digits (57) 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 (57).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (65815807877) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28297 + ... + 363912.
It is an arithmetic number, because the mean of its divisors is an integer number (1500203250).
Almost surely, 265815807872 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 65815807872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96013008000).
65815807872 is an abundant number, since it is smaller than the sum of its proper divisors (126210208128).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
65815807872 is a wasteful number, since it uses less digits than its factorization.
65815807872 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 392268 (or 392256 counting only the distinct ones).
The product of its (nonzero) digits is 7526400, while the sum is 57.
The spelling of 65815807872 in words is "sixty-five billion, eight hundred fifteen million, eight hundred seven thousand, eight hundred seventy-two".
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