5661656 has 96 divisors (see below), whose sum is σ = 14651280. Its totient is φ = 2016000.

The previous prime is 5661653. The next prime is 5661659. The reversal of 5661656 is 6561665.

5661656 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (5661653) and next prime (5661659).

5661656 is strictly pandigital in base 8.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56006 + ... + 56106.

Almost surely, 2^5661656 is an apocalyptic number.

5661656 is a gapful number since it is divisible by the number (56) 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 5661656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7325640).

5661656 is an abundant number, since it is smaller than the sum of its proper divisors (8989624).

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

5661656 is a wasteful number, since it uses less digits than its factorization.

5661656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 134 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 5661656 is about 2379.4234595801. The cubic root of 5661656 is about 178.2301445912.

Subtracting 5661656 from its reverse (6561665), we obtain a palindrome (900009).

It can be divided in two parts, 566 and 1656, that added together give a palindrome (2222).

The spelling of 5661656 in words is "five million, six hundred sixty-one thousand, six hundred fifty-six".