66606 has 16 divisors (see below), whose sum is σ = 141264. Its totient is φ = 20864.

The previous prime is 66601. The next prime is 66617. The reversal of 66606 is 60666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66601) by changing a digit.

66606 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, 225 + ... + 428.

It is an arithmetic number, because the mean of its divisors is an integer number (8829).

2⁶⁶⁶⁰⁶ is an apocalyptic number.

66606 is an abundant number, since it is smaller than the sum of its proper divisors (74658).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70632).

66606 is a wasteful number, since it uses less digits than its factorization.

66606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 66606 is about 258.0813825133. The cubic root of 66606 is about 40.5357100070.

It can be divided in two parts, 6660 and 6, that added together give a palindrome (6666).

The spelling of 66606 in words is "sixty-six thousand, six hundred six".