655556 has 24 divisors (see below), whose sum is σ = 1282176. Its totient is φ = 290720.

The previous prime is 655547. The next prime is 655559.

655556 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (655559) by changing a digit.

655556 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1910 + ... + 2226.

It is an arithmetic number, because the mean of its divisors is an integer number (53424).

2⁶⁵⁵⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

655556 is a deficient number, since it is larger than the sum of its proper divisors (626620).

655556 is a wasteful number, since it uses less digits than its factorization.

655556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379 (or 377 counting only the distinct ones).

The product of its digits is 22500, while the sum is 32.

The square root of 655556 is about 809.6641278950. The cubic root of 655556 is about 86.8700221429.

It can be divided in two parts, 6 and 55556, that multiplied together give a triangular number (333336 = T₈₁₆).

The spelling of 655556 in words is "six hundred fifty-five thousand, five hundred fifty-six".