5661566 has 8 divisors (see below), whose sum is σ = 8652744. Its totient is φ = 2777320.

The previous prime is 5661559. The next prime is 5661587. The reversal of 5661566 is 6651665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26600 + ... + 26811.

It is an arithmetic number, because the mean of its divisors is an integer number (1081593).

Almost surely, 2^5661566 is an apocalyptic number.

5661566 is a deficient number, since it is larger than the sum of its proper divisors (2991178).

5661566 is a wasteful number, since it uses less digits than its factorization.

5661566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53466.

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

The square root of 5661566 is about 2379.4045473605. The cubic root of 5661566 is about 178.2292001798.

Subtracting 5661566 from its reverse (6651665), we obtain a palindrome (990099).

The spelling of 5661566 in words is "five million, six hundred sixty-one thousand, five hundred sixty-six".