666606 has 16 divisors (see below), whose sum is σ = 1341648. Its totient is φ = 220800.

The previous prime is 666599. The next prime is 666607. The reversal of 666606 is 606666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666607) by changing a digit.

666606 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, 1216 + ... + 1676.

It is an arithmetic number, because the mean of its divisors is an integer number (83853).

2⁶⁶⁶⁶⁰⁶ is an apocalyptic number.

666606 is an abundant number, since it is smaller than the sum of its proper divisors (675042).

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

666606 is a wasteful number, since it uses less digits than its factorization.

666606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 666606 is about 816.4594294881. The cubic root of 666606 is about 87.3553965325.

It can be divided in two parts, 66660 and 6, that added together give a palindrome (66666).

The spelling of 666606 in words is "six hundred sixty-six thousand, six hundred six".