165198517 has 12 divisors (see below), whose sum is σ = 182135520. Its totient is φ = 149722760.

The previous prime is 165198499. The next prime is 165198541. The reversal of 165198517 is 715891561.

It is a de Polignac number, because none of the positive numbers 2^k-165198517 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 (165198017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41538 + ... + 45340.

It is an arithmetic number, because the mean of its divisors is an integer number (15177960).

Almost surely, 2^165198517 is an apocalyptic number.

It is an amenable number.

165198517 is a deficient number, since it is larger than the sum of its proper divisors (16937003).

165198517 is a wasteful number, since it uses less digits than its factorization.

165198517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4184 (or 4173 counting only the distinct ones).

The product of its digits is 75600, while the sum is 43.

The square root of 165198517 is about 12852.9575195750. The cubic root of 165198517 is about 548.7005322061.

The spelling of 165198517 in words is "one hundred sixty-five million, one hundred ninety-eight thousand, five hundred seventeen".