258660865 has 8 divisors (see below), whose sum is σ = 328651560. Its totient is φ = 194756352.

The previous prime is 258660863. The next prime is 258660893. The reversal of 258660865 is 568066852.

258660865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1635841 + 257025024 = 1279^2 + 16032^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 258660865 - 2¹ = 258660863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (258660863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1521450 + ... + 1521619.

It is an arithmetic number, because the mean of its divisors is an integer number (41081445).

Almost surely, 2^258660865 is an apocalyptic number.

It is an amenable number.

258660865 is a deficient number, since it is larger than the sum of its proper divisors (69990695).

258660865 is a wasteful number, since it uses less digits than its factorization.

258660865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043091.

The product of its (nonzero) digits is 691200, while the sum is 46.

The square root of 258660865 is about 16082.9370762930. The cubic root of 258660865 is about 637.1527695121.

The spelling of 258660865 in words is "two hundred fifty-eight million, six hundred sixty thousand, eight hundred sixty-five".