666345 has 16 divisors (see below), whose sum is σ = 1101312. Its totient is φ = 343680.

The previous prime is 666329. The next prime is 666353. The reversal of 666345 is 543666.

666345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666345 - 2⁴ = 666329 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252 + ... + 1181.

It is an arithmetic number, because the mean of its divisors is an integer number (68832).

2⁶⁶⁶³⁴⁵ is an apocalyptic number.

It is an amenable number.

666345 is a deficient number, since it is larger than the sum of its proper divisors (434967).

666345 is a wasteful number, since it uses less digits than its factorization.

666345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472.

The product of its digits is 12960, while the sum is 30.

The square root of 666345 is about 816.2995773612. The cubic root of 666345 is about 87.3439941275.

The spelling of 666345 in words is "six hundred sixty-six thousand, three hundred forty-five".