258449665 has 4 divisors (see below), whose sum is σ = 310139604. Its totient is φ = 206759728.

The previous prime is 258449627. The next prime is 258449669. The reversal of 258449665 is 566944852.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40857664 + 217592001 = 6392^2 + 14751^2 .

It is a cyclic number.

It is not a de Polignac number, because 258449665 - 2¹³ = 258441473 is a prime.

It is a super-2 number, since 2×258449665² = 133592458677224450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258449669) 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 3 ways as a sum of consecutive naturals, for example, 25844962 + ... + 25844971.

It is an arithmetic number, because the mean of its divisors is an integer number (77534901).

Almost surely, 2^258449665 is an apocalyptic number.

It is an amenable number.

258449665 is a deficient number, since it is larger than the sum of its proper divisors (51689939).

258449665 is an equidigital number, since it uses as much as digits as its factorization.

258449665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51689938.

The product of its digits is 2073600, while the sum is 49.

The square root of 258449665 is about 16076.3697705670. The cubic root of 258449665 is about 636.9793077521.

The spelling of 258449665 in words is "two hundred fifty-eight million, four hundred forty-nine thousand, six hundred sixty-five".