| Base | Representation |
|---|---|
| bin | 10110101010000010… |
| … | …01011101100011101 |
| 3 | 1011101201022122020200 |
| 4 | 23111001023230131 |
| 5 | 144402412313040 |
| 6 | 5331000134113 |
| 7 | 610300344255 |
| oct | 132501135435 |
| 9 | 34351278220 |
| 10 | 12163791645 |
| 11 | 5182163775 |
| 12 | 2435767339 |
| 13 | 11bb082065 |
| 14 | 835696965 |
| 15 | 4b2d26630 |
| hex | 2d504bb1d |
12163791645 has 54 divisors (see below), whose sum is σ = 21664715982. Its totient is φ = 6313344000.
The previous prime is 12163791641. The next prime is 12163791677. The reversal of 12163791645 is 54619736121.
12163791645 is a `hidden beast` number, since 1 + 2 + 1 + 637 + 9 + 1 + 6 + 4 + 5 = 666.
12163791645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in 9 ways, for example, as 1370036196 + 10793755449 = 37014^2 + 103893^2 .
It is not a de Polignac number, because 12163791645 - 22 = 12163791641 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (45).
It is a self number, because there is not a number n which added to its sum of digits gives 12163791645.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12163791641) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 30333445 + ... + 30333845.
Almost surely, 212163791645 is an apocalyptic number.
12163791645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.
It is an amenable number.
12163791645 is a deficient number, since it is larger than the sum of its proper divisors (9500924337).
12163791645 is an frugal number, since it uses more digits than its factorization.
12163791645 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 895 (or 450 counting only the distinct ones).
The product of its digits is 272160, while the sum is 45.
Multiplying 12163791645 by its sum of digits (45), we get a square (547370624025 = 7398452).
12163791645 divided by its sum of digits (45) gives a square (270306481 = 164412).
The spelling of 12163791645 in words is "twelve billion, one hundred sixty-three million, seven hundred ninety-one thousand, six hundred forty-five".
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