666007 has 4 divisors (see below), whose sum is σ = 701080. Its totient is φ = 630936.

The previous prime is 665993. The next prime is 666013. The reversal of 666007 is 700666.

666007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666007 - 2¹¹ = 663959 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17508 + ... + 17545.

It is an arithmetic number, because the mean of its divisors is an integer number (175270).

2⁶⁶⁶⁰⁰⁷ is an apocalyptic number.

666007 is a deficient number, since it is larger than the sum of its proper divisors (35073).

666007 is a wasteful number, since it uses less digits than its factorization.

666007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35072.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 666007 is about 816.0925192648. The cubic root of 666007 is about 87.3292233691.

The spelling of 666007 in words is "six hundred sixty-six thousand, seven".