56661606 has 40 divisors (see below), whose sum is σ = 128258064. Its totient is φ = 18694800.

The previous prime is 56661601. The next prime is 56661607. The reversal of 56661606 is 60616665.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56661601) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14631 + ... + 18093.

Almost surely, 2^56661606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56661606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64129032).

56661606 is an abundant number, since it is smaller than the sum of its proper divisors (71596458).

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

56661606 is a wasteful number, since it uses less digits than its factorization.

56661606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578 (or 3569 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 56661606 is about 7527.3903844560. The cubic root of 56661606 is about 384.0870164129.

The spelling of 56661606 in words is "fifty-six million, six hundred sixty-one thousand, six hundred six".