165535143517 has 4 divisors (see below), whose sum is σ = 167174105436. Its totient is φ = 163896181600.

The previous prime is 165535143491. The next prime is 165535143523. The reversal of 165535143517 is 715341535561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 715341535561 = 101 ⋅7082589461.

It can be written as a sum of positive squares in 2 ways, for example, as 76068949636 + 89466193881 = 275806^2 + 299109^2 .

It is a cyclic number.

It is not a de Polignac number, because 165535143517 - 2¹¹ = 165535141469 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 (165535143547) 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, 819480808 + ... + 819481009.

It is an arithmetic number, because the mean of its divisors is an integer number (41793526359).

Almost surely, 2^165535143517 is an apocalyptic number.

It is an amenable number.

165535143517 is a deficient number, since it is larger than the sum of its proper divisors (1638961919).

165535143517 is a wasteful number, since it uses less digits than its factorization.

165535143517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638961918.

The product of its digits is 945000, while the sum is 46.

The spelling of 165535143517 in words is "one hundred sixty-five billion, five hundred thirty-five million, one hundred forty-three thousand, five hundred seventeen".