258666681 has 32 divisors (see below), whose sum is σ = 428646400. Its totient is φ = 135100224.

The previous prime is 258666677. The next prime is 258666691. The reversal of 258666681 is 186666852.

It is a happy number.

It is not a de Polignac number, because 258666681 - 2² = 258666677 is a prime.

It is a super-2 number, since 2×258666681² = 133816903719111522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 258666681.

It is not an unprimeable number, because it can be changed into a prime (258666691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23520 + ... + 32718.

It is an arithmetic number, because the mean of its divisors is an integer number (13395200).

Almost surely, 2^258666681 is an apocalyptic number.

258666681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

258666681 is a deficient number, since it is larger than the sum of its proper divisors (169979719).

258666681 is a wasteful number, since it uses less digits than its factorization.

258666681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9325.

The product of its digits is 829440, while the sum is 48.

The square root of 258666681 is about 16083.1178880216. The cubic root of 258666681 is about 637.1575449449.

The spelling of 258666681 in words is "two hundred fifty-eight million, six hundred sixty-six thousand, six hundred eighty-one".