165245273 has 4 divisors (see below), whose sum is σ = 165362340. Its totient is φ = 165128208.

The previous prime is 165245251. The next prime is 165245291. The reversal of 165245273 is 372542561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 372542561 = 7547 ⋅49363.

It can be written as a sum of positive squares in 2 ways, for example, as 62283664 + 102961609 = 7892^2 + 10147^2 .

It is a cyclic number.

It is not a de Polignac number, because 165245273 - 2¹⁰ = 165244249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165245203) 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, 56390 + ... + 59247.

It is an arithmetic number, because the mean of its divisors is an integer number (41340585).

Almost surely, 2^165245273 is an apocalyptic number.

It is an amenable number.

165245273 is a deficient number, since it is larger than the sum of its proper divisors (117067).

165245273 is a wasteful number, since it uses less digits than its factorization.

165245273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117066.

The product of its digits is 50400, while the sum is 35.

The square root of 165245273 is about 12854.7762718765. The cubic root of 165245273 is about 548.7522934094.

The spelling of 165245273 in words is "one hundred sixty-five million, two hundred forty-five thousand, two hundred seventy-three".