| Base | Representation |
|---|---|
| bin | 111110000000000000… |
| … | …000000000000000000 |
| 3 | 20100211111221122102122 |
| 4 | 332000000000000000 |
| 5 | 2042314412234323 |
| 6 | 50325512503412 |
| 7 | 4544500414256 |
| oct | 760000000000 |
| 9 | 210744848378 |
| 10 | 66571993088 |
| 11 | 26262177807 |
| 12 | 10a9a9aab68 |
| 13 | 637c196ab3 |
| 14 | 33176385d6 |
| 15 | 1ae96c4ec8 |
| hex | f80000000 |
66571993088 has 64 divisors (see below), whose sum is σ = 137438953440. Its totient is φ = 32212254720.
The previous prime is 66571993051. The next prime is 66571993121. The reversal of 66571993088 is 88039917566.
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (64).
It is an ABA number since it can be written as A⋅BA, here for A=31, B=2.
It is a Harshad number since it is a multiple of its sum of digits (62).
It is a nialpdrome in base 2, base 4, base 8 and base 16.
It is a zygodrome in base 2.
It is a self number, because there is not a number n which added to its sum of digits gives 66571993088.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2147483633 + ... + 2147483663.
Almost surely, 266571993088 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 66571993088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68719476720).
66571993088 is an abundant number, since it is smaller than the sum of its proper divisors (70866960352).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
66571993088 is an frugal number, since it uses more digits than its factorization.
66571993088 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 93 (or 33 counting only the distinct ones).
The product of its (nonzero) digits is 19595520, while the sum is 62.
Multiplying 66571993088 by its sum of digits (62), we get a square (4127463571456 = 20316162).
66571993088 divided by its sum of digits (62) gives a 30-th power (1073741824 = 230).
The spelling of 66571993088 in words is "sixty-six billion, five hundred seventy-one million, nine hundred ninety-three thousand, eighty-eight".
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