| Base | Representation |
|---|---|
| bin | 1100011010100100… |
| … | …11010000000000000 |
| 3 | 122012112002101020000 |
| 4 | 12031102122000000 |
| 5 | 102122314123330 |
| 6 | 3021222120000 |
| 7 | 324113536200 |
| oct | 61522320000 |
| 9 | 18175071200 |
| 10 | 6665379840 |
| 11 | 2910484589 |
| 12 | 1360280000 |
| 13 | 822ba6252 |
| 14 | 473334400 |
| 15 | 29026c560 |
| hex | 18d49a000 |
6665379840 has 840 divisors, whose sum is σ = 28474374852. Its totient is φ = 1486356480.
The previous prime is 6665379821. The next prime is 6665379841. The reversal of 6665379840 is 489735666.
It can be written as a sum of positive squares in 2 ways, for example, as 5868785664 + 796594176 = 76608^2 + 28224^2 .
It is a tau number, because it is divible by the number of its divisors (840).
It is a super-2 number, since 2×66653798402 = 88854576822956851200, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (54).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (6665379841) by changing a digit.
It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 162570220 + ... + 162570260.
Almost surely, 26665379840 is an apocalyptic number.
6665379840 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 6665379840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14237187426).
6665379840 is an abundant number, since it is smaller than the sum of its proper divisors (21808995012).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
6665379840 is an equidigital number, since it uses as much as digits as its factorization.
6665379840 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 98 (or 58 counting only the distinct ones).
The product of its (nonzero) digits is 6531840, while the sum is 54.
The square root of 6665379840 is about 81641.7775406685. Note that the first 3 decimals coincide. The cubic root of 6665379840 is about 1881.9509549442.
The spelling of 6665379840 in words is "six billion, six hundred sixty-five million, three hundred seventy-nine thousand, eight hundred forty".
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