555666 has 16 divisors (see below), whose sum is σ = 1141824. Its totient is φ = 180144.

The previous prime is 555661. The next prime is 555671. The reversal of 555666 is 666555.

It is an interprime number because it is at equal distance from previous prime (555661) and next prime (555671).

It is a Curzon number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (555661) by changing a digit.

555666 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 7 ways as a sum of consecutive naturals, for example, 1030 + ... + 1473.

It is an arithmetic number, because the mean of its divisors is an integer number (71364).

2⁵⁵⁵⁶⁶⁶ is an apocalyptic number.

555666 is an abundant number, since it is smaller than the sum of its proper divisors (586158).

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

555666 is a wasteful number, since it uses less digits than its factorization.

555666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545.

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

The square root of 555666 is about 745.4300772038. The cubic root of 555666 is about 82.2125163718.

Adding to 555666 its reverse (666555), we get a palindrome (1222221).

Subtracting 555666 from its reverse (666555), we obtain a square (110889 = 333²).

It can be divided in two parts, 555 and 666, that added together give a palindrome (1221).

The spelling of 555666 in words is "five hundred fifty-five thousand, six hundred sixty-six".