655566 has 16 divisors (see below), whose sum is σ = 1347024. Its totient is φ = 212544.

The previous prime is 655561. The next prime is 655579. The reversal of 655566 is 665556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1255 + ... + 1698.

It is an arithmetic number, because the mean of its divisors is an integer number (84189).

2⁶⁵⁵⁵⁶⁶ is an apocalyptic number.

655566 is an abundant number, since it is smaller than the sum of its proper divisors (691458).

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

655566 is a wasteful number, since it uses less digits than its factorization.

655566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2995.

The product of its digits is 27000, while the sum is 33.

The square root of 655566 is about 809.6703032716. The cubic root of 655566 is about 86.8704638523.

It can be divided in two parts, 655 and 566, that added together give a palindrome (1221).

The spelling of 655566 in words is "six hundred fifty-five thousand, five hundred sixty-six".