Base | Representation |
---|---|
bin | 10100011001111110101 |
3 | 1020222020020 |
4 | 2203033311 |
5 | 132344121 |
6 | 22155353 |
7 | 5453310 |
oct | 2431765 |
9 | 1228206 |
10 | 668661 |
11 | 417414 |
12 | 282b59 |
13 | 1a5476 |
14 | 135977 |
15 | d31c6 |
hex | a33f5 |
668661 has 16 divisors (see below), whose sum is σ = 1079424. Its totient is φ = 359424.
The previous prime is 668623. The next prime is 668671. The reversal of 668661 is 166866.
It is not a de Polignac number, because 668661 - 27 = 668533 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (668611) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 580 + ... + 1293.
It is an arithmetic number, because the mean of its divisors is an integer number (67464).
2668661 is an apocalyptic number.
It is an amenable number.
668661 is a deficient number, since it is larger than the sum of its proper divisors (410763).
668661 is a wasteful number, since it uses less digits than its factorization.
668661 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1900.
The product of its digits is 10368, while the sum is 33.
The square root of 668661 is about 817.7169436914. The cubic root of 668661 is about 87.4450702860.
The spelling of 668661 in words is "six hundred sixty-eight thousand, six hundred sixty-one".
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