| Base | Representation |
|---|---|
| bin | 10011010011010… |
| … | …10111010110000 |
| 3 | 102021200022121200 |
| 4 | 21221222322300 |
| 5 | 312422344030 |
| 6 | 24022251200 |
| 7 | 4004200002 |
| oct | 1151527260 |
| 9 | 367608550 |
| 10 | 161918640 |
| 11 | 83442964 |
| 12 | 46286b00 |
| 13 | 27712b60 |
| 14 | 1770c372 |
| 15 | e335d60 |
| hex | 9a6aeb0 |
161918640 has 120 divisors (see below), whose sum is σ = 585639600. Its totient is φ = 39854592.
The previous prime is 161918633. The next prime is 161918671. The reversal of 161918640 is 46819161.
It is a happy number.
161918640 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 1 + 8 + 640 = 666.
161918640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a tau number, because it is divible by the number of its divisors (120).
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 161918595 and 161918604.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 711 + ... + 18009.
It is an arithmetic number, because the mean of its divisors is an integer number (4880330).
Almost surely, 2161918640 is an apocalyptic number.
161918640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 161918640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292819800).
161918640 is an abundant number, since it is smaller than the sum of its proper divisors (423720960).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
161918640 is a wasteful number, since it uses less digits than its factorization.
161918640 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 17331 (or 17322 counting only the distinct ones).
The product of its (nonzero) digits is 10368, while the sum is 36.
The square root of 161918640 is about 12724.7255373151. The cubic root of 161918640 is about 545.0449027336.
The spelling of 161918640 in words is "one hundred sixty-one million, nine hundred eighteen thousand, six hundred forty".
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