655866 has 24 divisors (see below), whose sum is σ = 1441440. Its totient is φ = 215496.

The previous prime is 655859. The next prime is 655883. The reversal of 655866 is 668556.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 655866.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655866.

It is an unprimeable number.

655866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1275 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (60060).

2⁶⁵⁵⁸⁶⁶ is an apocalyptic number.

655866 is an abundant number, since it is smaller than the sum of its proper divisors (785574).

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

655866 is a wasteful number, since it uses less digits than its factorization.

655866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 527 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 655866 is about 809.8555426741. The cubic root of 655866 is about 86.8837130471.

It can be divided in two parts, 655 and 866, that added together give a square (1521 = 39²).

The spelling of 655866 in words is "six hundred fifty-five thousand, eight hundred sixty-six".