666105 has 24 divisors (see below), whose sum is σ = 1174656. Its totient is φ = 322080.

The previous prime is 666091. The next prime is 666109. The reversal of 666105 is 501666.

It is not a de Polignac number, because 666105 - 2⁴ = 666089 is a prime.

666105 is a lucky number.

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

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 23 ways as a sum of consecutive naturals, for example, 1632 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (48944).

2⁶⁶⁶¹⁰⁵ is an apocalyptic number.

It is an amenable number.

666105 is a deficient number, since it is larger than the sum of its proper divisors (508551).

666105 is a wasteful number, since it uses less digits than its factorization.

666105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 666105 is about 816.1525592682. The cubic root of 666105 is about 87.3335065293. Note that the first 3 decimals are identical.

The spelling of 666105 in words is "six hundred sixty-six thousand, one hundred five".