165664255 has 4 divisors (see below), whose sum is σ = 198797112. Its totient is φ = 132531400.

The previous prime is 165664253. The next prime is 165664259. The reversal of 165664255 is 552466561.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 165664255 - 2¹ = 165664253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165664253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16566421 + ... + 16566430.

It is an arithmetic number, because the mean of its divisors is an integer number (49699278).

Almost surely, 2^165664255 is an apocalyptic number.

165664255 is a deficient number, since it is larger than the sum of its proper divisors (33132857).

165664255 is an equidigital number, since it uses as much as digits as its factorization.

165664255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33132856.

The product of its digits is 216000, while the sum is 40.

The square root of 165664255 is about 12871.0626989383. The cubic root of 165664255 is about 549.2156920144.

The spelling of 165664255 in words is "one hundred sixty-five million, six hundred sixty-four thousand, two hundred fifty-five".