165799517 has 8 divisors (see below), whose sum is σ = 178673880. Its totient is φ = 152942400.

The previous prime is 165799493. The next prime is 165799519. The reversal of 165799517 is 715997561.

It can be written as a sum of positive squares in 4 ways, for example, as 188356 + 165611161 = 434^2 + 12869^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165799517 - 2⁸ = 165799261 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 (165799519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21359 + ... + 28067.

It is an arithmetic number, because the mean of its divisors is an integer number (22334235).

Almost surely, 2^165799517 is an apocalyptic number.

It is an amenable number.

165799517 is a deficient number, since it is larger than the sum of its proper divisors (12874363).

165799517 is a wasteful number, since it uses less digits than its factorization.

165799517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8623.

The product of its digits is 595350, while the sum is 50.

The square root of 165799517 is about 12876.3161269052. The cubic root of 165799517 is about 549.3651263906.

The spelling of 165799517 in words is "one hundred sixty-five million, seven hundred ninety-nine thousand, five hundred seventeen".