1566 is nontrivially palindromic in base 15.
1566 is an undulating number in base 15.
It is a plaindrome in base 10.
It is a nialpdrome in base 12.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 1566.
1566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1800).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1566 is a wasteful number, since it uses less digits than its factorization.
1566 is an evil number, because the sum of its binary digits is even.
The square root of 1566 is about 39.5727178748. The cubic root of 1566 is about 11.6126299219.
The spelling of 1566 in words is "one thousand, five hundred sixty-six".