| Base | Representation |
|---|---|
| bin | 10111111011010011001… |
| … | …101011110000000000000 |
| 3 | 12211012000120221120122000 |
| 4 | 113323103031132000000 |
| 5 | 203414331040433100 |
| 6 | 3255202242544000 |
| 7 | 226535221105644 |
| oct | 27732315360000 |
| 9 | 5735016846560 |
| 10 | 1644221030400 |
| 11 | 5843459a8103 |
| 12 | 2267b2368000 |
| 13 | bc084638710 |
| 14 | 5981b706c24 |
| 15 | 2cb83951900 |
| hex | 17ed335e000 |
1644221030400 has 1344 divisors, whose sum is σ = 6603974193600. Its totient is φ = 398626652160.
The previous prime is 1644221030369. The next prime is 1644221030429. The reversal of 1644221030400 is 40301224461.
It is a happy number.
1644221030400 is a `hidden beast` number, since 1 + 6 + 4 + 4 + 221 + 0 + 30 + 400 = 666.
It is a super-3 number, since 3×16442210304003 (a number of 38 digits) contains 333 as substring.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6397747072 + ... + 6397747328.
It is an arithmetic number, because the mean of its divisors is an integer number (4913671275).
Almost surely, 21644221030400 is an apocalyptic number.
1644221030400 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 1644221030400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3301987096800).
1644221030400 is an abundant number, since it is smaller than the sum of its proper divisors (4959753163200).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1644221030400 is a wasteful number, since it uses less digits than its factorization.
1644221030400 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 404 (or 369 counting only the distinct ones).
The product of its (nonzero) digits is 4608, while the sum is 27.
Adding to 1644221030400 its reverse (40301224461), we get a palindrome (1684522254861).
The spelling of 1644221030400 in words is "one trillion, six hundred forty-four billion, two hundred twenty-one million, thirty thousand, four hundred".
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