205257165 has 24 divisors (see below), whose sum is σ = 334157088. Its totient is φ = 107587680.

The previous prime is 205257139. The next prime is 205257203. The reversal of 205257165 is 561752502.

It is not a de Polignac number, because 205257165 - 2¹¹ = 205255117 is a prime.

It is a congruent number.

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, 50250 + ... + 54180.

It is an arithmetic number, because the mean of its divisors is an integer number (13923212).

Almost surely, 2^205257165 is an apocalyptic number.

It is an amenable number.

205257165 is a deficient number, since it is larger than the sum of its proper divisors (128899923).

205257165 is an equidigital number, since it uses as much as digits as its factorization.

205257165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4057 (or 3998 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 205257165 is about 14326.7988399363. The cubic root of 205257165 is about 589.8833102560.

The spelling of 205257165 in words is "two hundred five million, two hundred fifty-seven thousand, one hundred sixty-five".