258287666 has 16 divisors (see below), whose sum is σ = 476839104. Its totient is φ = 102179664.

The previous prime is 258287633. The next prime is 258287669. The reversal of 258287666 is 666782852.

It is not an unprimeable number, because it can be changed into a prime (258287669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709400 + ... + 709763.

It is an arithmetic number, because the mean of its divisors is an integer number (29802444).

Almost surely, 2^258287666 is an apocalyptic number.

258287666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

258287666 is a deficient number, since it is larger than the sum of its proper divisors (218551438).

258287666 is a wasteful number, since it uses less digits than its factorization.

258287666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419185.

The product of its digits is 1935360, while the sum is 50.

The square root of 258287666 is about 16071.3305609710. The cubic root of 258287666 is about 636.8461914661.

The spelling of 258287666 in words is "two hundred fifty-eight million, two hundred eighty-seven thousand, six hundred sixty-six".