165766255 has 4 divisors (see below), whose sum is σ = 198919512. Its totient is φ = 132613000.

The previous prime is 165766231. The next prime is 165766261. The reversal of 165766255 is 552667561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 552667561 = 22511 ⋅24551.

It is not a de Polignac number, because 165766255 - 2¹³ = 165758063 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, 16576621 + ... + 16576630.

It is an arithmetic number, because the mean of its divisors is an integer number (49729878).

Almost surely, 2^165766255 is an apocalyptic number.

165766255 is a deficient number, since it is larger than the sum of its proper divisors (33153257).

165766255 is an equidigital number, since it uses as much as digits as its factorization.

165766255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33153256.

The product of its digits is 378000, while the sum is 43.

The square root of 165766255 is about 12875.0244659962. The cubic root of 165766255 is about 549.3283868286.

The spelling of 165766255 in words is "one hundred sixty-five million, seven hundred sixty-six thousand, two hundred fifty-five".