258494065 has 4 divisors (see below), whose sum is σ = 310192884. Its totient is φ = 206795248.

The previous prime is 258494059. The next prime is 258494077. The reversal of 258494065 is 560494852.

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 122235136 + 136258929 = 11056^2 + 11673^2 .

It is a cyclic number.

It is not a de Polignac number, because 258494065 - 2³ = 258494057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25849402 + ... + 25849411.

It is an arithmetic number, because the mean of its divisors is an integer number (77548221).

Almost surely, 2^258494065 is an apocalyptic number.

It is an amenable number.

258494065 is a deficient number, since it is larger than the sum of its proper divisors (51698819).

258494065 is an equidigital number, since it uses as much as digits as its factorization.

258494065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51698818.

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 258494065 is about 16077.7506200339. The cubic root of 258494065 is about 637.0157819876.

The spelling of 258494065 in words is "two hundred fifty-eight million, four hundred ninety-four thousand, sixty-five".