1656 is nontrivially palindromic in base 7.
1656 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.
It is a tau number, because it is divible by the number of its divisors (24).
It is an alternating number because its digits alternate between odd and even.
It is a plaindrome in base 16.
It is a nialpdrome in base 12 and base 14.
It is a zygodrome in base 2.
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 1656.
21656 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 1656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2340).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1656 is a wasteful number, since it uses less digits than its factorization.
1656 is an evil number, because the sum of its binary digits is even.
The square root of 1656 is about 40.6939798988. The cubic root of 1656 is about 11.8309633994.
The spelling of 1656 in words is "one thousand, six hundred fifty-six".