5566639 has 16 divisors (see below), whose sum is σ = 6522880. Its totient is φ = 4704480.

The previous prime is 5566619. The next prime is 5566657. The reversal of 5566639 is 9366655.

It is a cyclic number.

It is not a de Polignac number, because 5566639 - 2⁵ = 5566607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5566619) 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 15 ways as a sum of consecutive naturals, for example, 7294 + ... + 8020.

It is an arithmetic number, because the mean of its divisors is an integer number (407680).

Almost surely, 2^5566639 is an apocalyptic number.

5566639 is a deficient number, since it is larger than the sum of its proper divisors (956241).

5566639 is a wasteful number, since it uses less digits than its factorization.

5566639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790.

The product of its digits is 145800, while the sum is 40.

The square root of 5566639 is about 2359.3725860915. The cubic root of 5566639 is about 177.2274624653.

The spelling of 5566639 in words is "five million, five hundred sixty-six thousand, six hundred thirty-nine".