Base | Representation |
---|---|
bin | 11110010011010110110100… |
… | …00111001000110010000000 |
3 | 22201221022121012210201101012 |
4 | 33021223122013020302000 |
5 | 32213230040133343313 |
6 | 353420020002500052 |
7 | 20015163536632544 |
oct | 1711533207106200 |
9 | 281838535721335 |
10 | 66635781934208 |
11 | 1a26109278a903 |
12 | 7582564664628 |
13 | 2b2495ba88406 |
14 | 1265290a9ba24 |
15 | 7a8539de2da8 |
hex | 3c9ada1c8c80 |
66635781934208 has 128 divisors (see below), whose sum is σ = 135158315040000. Its totient is φ = 32719997140992.
The previous prime is 66635781934199. The next prime is 66635781934237. The reversal of 66635781934208 is 80243918753666.
It is a tau number, because it is divible by the number of its divisors (128).
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 839741318 + ... + 839820666.
It is an arithmetic number, because the mean of its divisors is an integer number (1055924336250).
It is a 1-persistent number, because it is pandigital, but 2⋅66635781934208 = 133271563868416 is not.
Almost surely, 266635781934208 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 66635781934208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67579157520000).
66635781934208 is an abundant number, since it is smaller than the sum of its proper divisors (68522533105792).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
66635781934208 is a wasteful number, since it uses less digits than its factorization.
66635781934208 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 79982 (or 79970 counting only the distinct ones).
The product of its (nonzero) digits is 313528320, while the sum is 68.
The spelling of 66635781934208 in words is "sixty-six trillion, six hundred thirty-five billion, seven hundred eighty-one million, nine hundred thirty-four thousand, two hundred eight".
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