Base | Representation |
---|---|
bin | 111110000111001000… |
… | …001110111000000000 |
3 | 20101010211222212212010 |
4 | 332013020032320000 |
5 | 2043041021413210 |
6 | 50345424132520 |
7 | 4550452114230 |
oct | 760710167000 |
9 | 211124885763 |
10 | 66691591680 |
11 | 26313734a1a |
12 | 10b12a67140 |
13 | 639abb00ac |
14 | 332948bcc0 |
15 | 1b04e4b920 |
hex | f8720ee00 |
66691591680 has 160 divisors (see below), whose sum is σ = 243662690304. Its totient is φ = 15243780096.
The previous prime is 66691591657. The next prime is 66691591691. The reversal of 66691591680 is 8619519666.
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (160).
It is a self number, because there is not a number n which added to its sum of digits gives 66691591680.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566512 + ... + 674031.
Almost surely, 266691591680 is an apocalyptic number.
66691591680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.
It is an amenable number.
66691591680 is an abundant number, since it is smaller than the sum of its proper divisors (176971098624).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
66691591680 is a wasteful number, since it uses less digits than its factorization.
66691591680 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1240576 (or 1240560 counting only the distinct ones).
The product of its (nonzero) digits is 4199040, while the sum is 57.
The spelling of 66691591680 in words is "sixty-six billion, six hundred ninety-one million, five hundred ninety-one thousand, six hundred eighty".
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