Base | Representation |
---|---|
bin | 10001101100010011… |
… | …110011100111010100 |
3 | 1211000221012121211001 |
4 | 101230103303213110 |
5 | 302401213010120 |
6 | 12421015353044 |
7 | 1241522561401 |
oct | 215423634724 |
9 | 54027177731 |
10 | 18997000660 |
11 | 8069347850 |
12 | 3822082784 |
13 | 1a3995a4c1 |
14 | cc2dd72a8 |
15 | 762b95e0a |
hex | 46c4f39d4 |
18997000660 has 96 divisors (see below), whose sum is σ = 45918835200. Its totient is φ = 6529011840.
The previous prime is 18997000643. The next prime is 18997000669. The reversal of 18997000660 is 6600079981.
18997000660 is a nontrivial binomial coefficient, being equal to C(194921, 2).
It is a self number, because there is not a number n which added to its sum of digits gives 18997000660.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (18997000669) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1846611 + ... + 1856869.
It is an arithmetic number, because the mean of its divisors is an integer number (478321200).
Almost surely, 218997000660 is an apocalyptic number.
18997000660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
18997000660 is the 194920-th triangular number.
18997000660 is the 64974-th centered nonagonal number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 18997000660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22959417600).
18997000660 is an abundant number, since it is smaller than the sum of its proper divisors (26921834540).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
18997000660 is a wasteful number, since it uses less digits than its factorization.
18997000660 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 10741 (or 10739 counting only the distinct ones).
The product of its (nonzero) digits is 163296, while the sum is 46.
The spelling of 18997000660 in words is "eighteen billion, nine hundred ninety-seven million, six hundred sixty", and thus it is an aban number.
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