258256617 has 4 divisors (see below), whose sum is σ = 344342160. Its totient is φ = 172171076.

The previous prime is 258256601. The next prime is 258256619. The reversal of 258256617 is 716652852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 258256617 - 2⁴ = 258256601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (258256619) 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 3 ways as a sum of consecutive naturals, for example, 43042767 + ... + 43042772.

It is an arithmetic number, because the mean of its divisors is an integer number (86085540).

Almost surely, 2^258256617 is an apocalyptic number.

It is an amenable number.

258256617 is a deficient number, since it is larger than the sum of its proper divisors (86085543).

258256617 is an equidigital number, since it uses as much as digits as its factorization.

258256617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86085542.

The product of its digits is 201600, while the sum is 42.

The square root of 258256617 is about 16070.3645571592. The cubic root of 258256617 is about 636.8206718196.

The spelling of 258256617 in words is "two hundred fifty-eight million, two hundred fifty-six thousand, six hundred seventeen".