258065665 has 32 divisors (see below), whose sum is σ = 365412096. Its totient is φ = 172488960.

The previous prime is 258065569. The next prime is 258065699. The reversal of 258065665 is 566560852.

It is not a de Polignac number, because 258065665 - 2⁷ = 258065537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197404 + ... + 198706.

It is an arithmetic number, because the mean of its divisors is an integer number (11419128).

Almost surely, 2^258065665 is an apocalyptic number.

It is an amenable number.

258065665 is a deficient number, since it is larger than the sum of its proper divisors (107346431).

258065665 is a wasteful number, since it uses less digits than its factorization.

258065665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609.

The product of its (nonzero) digits is 432000, while the sum is 43.

The square root of 258065665 is about 16064.4223363307. The cubic root of 258065665 is about 636.6636804711.

The spelling of 258065665 in words is "two hundred fifty-eight million, sixty-five thousand, six hundred sixty-five".