Base | Representation |
---|---|
bin | 1000100010110100100100… |
… | …11010001001110011001001 |
3 | 2110112011202212002100111121 |
4 | 10101122102122021303021 |
5 | 4430313120140011441 |
6 | 103543214503355241 |
7 | 3646302044556106 |
oct | 421322232116311 |
9 | 73464685070447 |
10 | 18788643282121 |
11 | 5a9424534a799 |
12 | 2135446752b21 |
13 | a639b8c0582b |
14 | 48d537727aad |
15 | 228b08146dd1 |
hex | 111692689cc9 |
18788643282121 has 8 divisors (see below), whose sum is σ = 19934374623264. Its totient is φ = 17647413833280.
The previous prime is 18788643282083. The next prime is 18788643282151. The reversal of 18788643282121 is 12128234688781.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 18788643282121 - 225 = 18788609727689 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 18788643282121.
It is not an unprimeable number, because it can be changed into a prime (18788643282151) 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 7 ways as a sum of consecutive naturals, for example, 1125464475 + ... + 1125481168.
It is an arithmetic number, because the mean of its divisors is an integer number (2491796827908).
Almost surely, 218788643282121 is an apocalyptic number.
It is an amenable number.
18788643282121 is a deficient number, since it is larger than the sum of its proper divisors (1145731341143).
18788643282121 is a wasteful number, since it uses less digits than its factorization.
18788643282121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2250946151.
The product of its digits is 16515072, while the sum is 61.
The spelling of 18788643282121 in words is "eighteen trillion, seven hundred eighty-eight billion, six hundred forty-three million, two hundred eighty-two thousand, one hundred twenty-one".
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