205120665 has 24 divisors (see below), whose sum is σ = 357908928. Its totient is φ = 108669600.

The previous prime is 205120649. The next prime is 205120681. The reversal of 205120665 is 566021502.

205120665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (205120649) and next prime (205120681).

It is not a de Polignac number, because 205120665 - 2⁴ = 205120649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8299 + ... + 21888.

It is an arithmetic number, because the mean of its divisors is an integer number (14912872).

Almost surely, 2^205120665 is an apocalyptic number.

It is an amenable number.

205120665 is a deficient number, since it is larger than the sum of its proper divisors (152788263).

205120665 is a wasteful number, since it uses less digits than its factorization.

205120665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30349 (or 30346 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 205120665 is about 14322.0342479691. The cubic root of 205120665 is about 589.7525199742.

The spelling of 205120665 in words is "two hundred five million, one hundred twenty thousand, six hundred sixty-five".