Base | Representation |
---|---|
bin | 1000101000010111000110… |
… | …10100010111110100101001 |
3 | 2111012101001200211222100122 |
4 | 10110023203110113310221 |
5 | 4441422422144012332 |
6 | 104210453412413025 |
7 | 3666120541066223 |
oct | 424134324276451 |
9 | 74171050758318 |
10 | 18978979282217 |
11 | 6057a38029809 |
12 | 2166305917175 |
13 | a7893002b366 |
14 | 49883214b413 |
15 | 22da47e7dc12 |
hex | 1142e3517d29 |
18978979282217 has 2 divisors, whose sum is σ = 18978979282218. Its totient is φ = 18978979282216.
The previous prime is 18978979282177. The next prime is 18978979282243. The reversal of 18978979282217 is 71228297987981.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 13975776619561 + 5003202662656 = 3738419^2 + 2236784^2 .
It is a cyclic number.
It is not a de Polignac number, because 18978979282217 - 228 = 18978710846761 is a prime.
It is a super-2 number, since 2×189789792822172 (a number of 27 digits) contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (18978879282217) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9489489641108 + 9489489641109.
It is an arithmetic number, because the mean of its divisors is an integer number (9489489641109).
Almost surely, 218978979282217 is an apocalyptic number.
It is an amenable number.
18978979282217 is a deficient number, since it is larger than the sum of its proper divisors (1).
18978979282217 is an equidigital number, since it uses as much as digits as its factorization.
18978979282217 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 1024192512, while the sum is 80.
The spelling of 18978979282217 in words is "eighteen trillion, nine hundred seventy-eight billion, nine hundred seventy-nine million, two hundred eighty-two thousand, two hundred seventeen".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.071 sec. • engine limits •