1661056 has 32 divisors (see below), whose sum is σ = 3488400. Its totient is φ = 785664.

The previous prime is 1661029. The next prime is 1661059. The reversal of 1661056 is 6501661.

It is a tau number, because it is divible by the number of its divisors (32).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1661056.

It is not an unprimeable number, because it can be changed into a prime (1661059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2091 + ... + 2773.

2^1661056 is an apocalyptic number.

1661056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1744200).

1661056 is an abundant number, since it is smaller than the sum of its proper divisors (1827344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661056 is an equidigital number, since it uses as much as digits as its factorization.

1661056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1661056 is about 1288.8196149966. The cubic root of 1661056 is about 118.4299169591.

The spelling of 1661056 in words is "one million, six hundred sixty-one thousand, fifty-six".