Base | Representation |
---|---|
bin | 10111111111100101… |
… | …01100010000000101 |
3 | 1020020201122120212000 |
4 | 23333302230100011 |
5 | 202340120210000 |
6 | 5530113215513 |
7 | 634133130210 |
oct | 137762542005 |
9 | 36221576760 |
10 | 12881413125 |
11 | 5510249379 |
12 | 25b5b61599 |
13 | 12a3951059 |
14 | 8a2ada777 |
15 | 505d2a000 |
hex | 2ffcac405 |
12881413125 has 80 divisors (see below), whose sum is σ = 27253776000. Its totient is φ = 5888592000.
The previous prime is 12881413079. The next prime is 12881413157. The reversal of 12881413125 is 52131418821.
It is a happy number.
It is not a de Polignac number, because 12881413125 - 212 = 12881409029 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 12881413125.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 63601 + ... + 172649.
It is an arithmetic number, because the mean of its divisors is an integer number (340672200).
Almost surely, 212881413125 is an apocalyptic number.
12881413125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
It is an amenable number.
12881413125 is an abundant number, since it is smaller than the sum of its proper divisors (14372362875).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
12881413125 is an equidigital number, since it uses as much as digits as its factorization.
12881413125 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 109085 (or 109064 counting only the distinct ones).
The product of its digits is 15360, while the sum is 36.
The spelling of 12881413125 in words is "twelve billion, eight hundred eighty-one million, four hundred thirteen thousand, one hundred twenty-five".
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