Base | Representation |
---|---|
bin | 10000110001111101… |
… | …010010011001100111 |
3 | 1201111201002012100001 |
4 | 100301331102121213 |
5 | 243400103101134 |
6 | 12135524402131 |
7 | 1205334430255 |
oct | 206175223147 |
9 | 51451065301 |
10 | 18018018919 |
11 | 770677a32a |
12 | 35aa246347 |
13 | 1911b9c074 |
14 | c2cd9b5d5 |
15 | 706c67414 |
hex | 431f52667 |
18018018919 has 4 divisors (see below), whose sum is σ = 18020700144. Its totient is φ = 18015337696.
The previous prime is 18018018901. The next prime is 18018018937. The reversal of 18018018919 is 91981081081.
It is a semiprime because it is the product of two primes.
It is an interprime number because it is at equal distance from previous prime (18018018901) and next prime (18018018937).
It is a cyclic number.
It is not a de Polignac number, because 18018018919 - 211 = 18018016871 is a prime.
It is a super-3 number, since 3×180180189193 (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (18018018959) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1330507 + ... + 1343980.
It is an arithmetic number, because the mean of its divisors is an integer number (4505175036).
Almost surely, 218018018919 is an apocalyptic number.
18018018919 is a deficient number, since it is larger than the sum of its proper divisors (2681225).
18018018919 is an equidigital number, since it uses as much as digits as its factorization.
18018018919 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2681224.
The product of its (nonzero) digits is 41472, while the sum is 46.
The spelling of 18018018919 in words is "eighteen billion, eighteen million, eighteen thousand, nine hundred nineteen".
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