165250565 has 8 divisors (see below), whose sum is σ = 198372888. Its totient is φ = 132152320.

The previous prime is 165250549. The next prime is 165250571. The reversal of 165250565 is 565052561.

It can be written as a sum of positive squares in 4 ways, for example, as 111872929 + 53377636 = 10577^2 + 7306^2 .

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

It is not a de Polignac number, because 165250565 - 2⁴ = 165250549 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17309 + ... + 25101.

It is an arithmetic number, because the mean of its divisors is an integer number (24796611).

Almost surely, 2^165250565 is an apocalyptic number.

It is an amenable number.

165250565 is a deficient number, since it is larger than the sum of its proper divisors (33122323).

165250565 is an equidigital number, since it uses as much as digits as its factorization.

165250565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12039.

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 165250565 is about 12854.9821081167. The cubic root of 165250565 is about 548.7581512999.

The spelling of 165250565 in words is "one hundred sixty-five million, two hundred fifty thousand, five hundred sixty-five".