666106 has 16 divisors (see below), whose sum is σ = 1166400. Its totient is φ = 285180.

The previous prime is 666091. The next prime is 666109. The reversal of 666106 is 601666.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (666109) by changing a digit.

666106 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (72900).

2⁶⁶⁶¹⁰⁶ is an apocalyptic number.

666106 is a deficient number, since it is larger than the sum of its proper divisors (500294).

666106 is an equidigital number, since it uses as much as digits as its factorization.

666106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 666106 is about 816.1531718985. The cubic root of 666106 is about 87.3335502329. Note that the first 3 decimals are identical.

The spelling of 666106 in words is "six hundred sixty-six thousand, one hundred six".