666087 has 4 divisors (see below), whose sum is σ = 888120. Its totient is φ = 444056.

The previous prime is 666079. The next prime is 666089. The reversal of 666087 is 780666.

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 666087 - 2³ = 666079 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666089) 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 3 ways as a sum of consecutive naturals, for example, 111012 + ... + 111017.

It is an arithmetic number, because the mean of its divisors is an integer number (222030).

2⁶⁶⁶⁰⁸⁷ is an apocalyptic number.

666087 is a deficient number, since it is larger than the sum of its proper divisors (222033).

666087 is a wasteful number, since it uses less digits than its factorization.

666087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222032.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 666087 is about 816.1415318436. The cubic root of 666087 is about 87.3327198579.

The spelling of 666087 in words is "six hundred sixty-six thousand, eighty-seven".