258075665 has 4 divisors (see below), whose sum is σ = 309690804. Its totient is φ = 206460528.

The previous prime is 258075661. The next prime is 258075673. The reversal of 258075665 is 566570852.

258075665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 89283601 + 168792064 = 9449^2 + 12992^2 .

It is a cyclic number.

It is not a de Polignac number, because 258075665 - 2² = 258075661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258075661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25807562 + ... + 25807571.

It is an arithmetic number, because the mean of its divisors is an integer number (77422701).

Almost surely, 2^258075665 is an apocalyptic number.

It is an amenable number.

258075665 is a deficient number, since it is larger than the sum of its proper divisors (51615139).

258075665 is an equidigital number, since it uses as much as digits as its factorization.

258075665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51615138.

The product of its (nonzero) digits is 504000, while the sum is 44.

The square root of 258075665 is about 16064.7335801127. The cubic root of 258075665 is about 636.6719039008.

The spelling of 258075665 in words is "two hundred fifty-eight million, seventy-five thousand, six hundred sixty-five".