165700565 has 4 divisors (see below), whose sum is σ = 198840684. Its totient is φ = 132560448.

The previous prime is 165700559. The next prime is 165700571. The reversal of 165700565 is 565007561.

165700565 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, and also an emirpimes, since its reverse is a distinct semiprime: 565007561 = 257 ⋅2198473.

It is an interprime number because it is at equal distance from previous prime (165700559) and next prime (165700571).

It can be written as a sum of positive squares in 2 ways, for example, as 110019121 + 55681444 = 10489^2 + 7462^2 .

It is a cyclic number.

It is not a de Polignac number, because 165700565 - 2¹⁸ = 165438421 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 16570052 + ... + 16570061.

It is an arithmetic number, because the mean of its divisors is an integer number (49710171).

Almost surely, 2^165700565 is an apocalyptic number.

It is an amenable number.

165700565 is a deficient number, since it is larger than the sum of its proper divisors (33140119).

165700565 is an equidigital number, since it uses as much as digits as its factorization.

165700565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33140118.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 165700565 is about 12872.4731500982. The cubic root of 165700565 is about 549.2558144597.

The spelling of 165700565 in words is "one hundred sixty-five million, seven hundred thousand, five hundred sixty-five".