165540174133 has 4 divisors (see below), whose sum is σ = 165706213420. Its totient is φ = 165374134848.

The previous prime is 165540174119. The next prime is 165540174161. The reversal of 165540174133 is 331471045561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 331471045561 = 4721 ⋅70212041.

It can be written as a sum of positive squares in 2 ways, for example, as 144625808209 + 20914365924 = 380297^2 + 144618^2 .

It is a cyclic number.

It is not a de Polignac number, because 165540174133 - 2¹³ = 165540165941 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 (165540171133) 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, 83018148 + ... + 83020141.

It is an arithmetic number, because the mean of its divisors is an integer number (41426553355).

Almost surely, 2^165540174133 is an apocalyptic number.

It is an amenable number.

165540174133 is a deficient number, since it is larger than the sum of its proper divisors (166039287).

165540174133 is an equidigital number, since it uses as much as digits as its factorization.

165540174133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166039286.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 165540174133 in words is "one hundred sixty-five billion, five hundred forty million, one hundred seventy-four thousand, one hundred thirty-three".