5661558 has 60 divisors (see below), whose sum is σ = 14419548. Its totient is φ = 1605240.

The previous prime is 5661547. The next prime is 5661559. The reversal of 5661558 is 8551665.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 43153 + ... + 43283.

Almost surely, 2^5661558 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5661558, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7209774).

5661558 is an abundant number, since it is smaller than the sum of its proper divisors (8757990).

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

5661558 is a wasteful number, since it uses less digits than its factorization.

5661558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 143 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 5661558 is about 2379.4028662671. The cubic root of 5661558 is about 178.2291162316.

The spelling of 5661558 in words is "five million, six hundred sixty-one thousand, five hundred fifty-eight".