258666 has 16 divisors (see below), whose sum is σ = 544800. Its totient is φ = 81648.

The previous prime is 258659. The next prime is 258673. The reversal of 258666 is 666852.

It is an interprime number because it is at equal distance from previous prime (258659) and next prime (258673).

258666 is a modest number, since divided by 666 gives 258 as remainder.

It is a congruent number.

It is an unprimeable 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, 1021 + ... + 1248.

It is an arithmetic number, because the mean of its divisors is an integer number (34050).

2²⁵⁸⁶⁶⁶ is an apocalyptic number.

258666 is an abundant number, since it is smaller than the sum of its proper divisors (286134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

258666 is a wasteful number, since it uses less digits than its factorization.

258666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293.

The product of its digits is 17280, while the sum is 33.

The square root of 258666 is about 508.5921745367. The cubic root of 258666 is about 63.7156985789.

The spelling of 258666 in words is "two hundred fifty-eight thousand, six hundred sixty-six".