165243055 has 4 divisors (see below), whose sum is σ = 198291672. Its totient is φ = 132194440.

The previous prime is 165243047. The next prime is 165243107. The reversal of 165243055 is 550342561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550342561 = 139 ⋅3959299.

It is not a de Polignac number, because 165243055 - 2³ = 165243047 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 16524301 + ... + 16524310.

It is an arithmetic number, because the mean of its divisors is an integer number (49572918).

Almost surely, 2^165243055 is an apocalyptic number.

165243055 is a deficient number, since it is larger than the sum of its proper divisors (33048617).

165243055 is an equidigital number, since it uses as much as digits as its factorization.

165243055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33048616.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 165243055 is about 12854.6900001517. The cubic root of 165243055 is about 548.7498381944.

The spelling of 165243055 in words is "one hundred sixty-five million, two hundred forty-three thousand, fifty-five".