165506617 has 8 divisors (see below), whose sum is σ = 166549824. Its totient is φ = 164467248.

The previous prime is 165506569. The next prime is 165506629. The reversal of 165506617 is 716605561.

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

It is a cyclic number.

It is not a de Polignac number, because 165506617 - 2¹⁹ = 164982329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165506687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146818 + ... + 147940.

It is an arithmetic number, because the mean of its divisors is an integer number (20818728).

Almost surely, 2^165506617 is an apocalyptic number.

It is an amenable number.

165506617 is a deficient number, since it is larger than the sum of its proper divisors (1043207).

165506617 is a wasteful number, since it uses less digits than its factorization.

165506617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 165506617 is about 12864.9375047063. The cubic root of 165506617 is about 549.0414344703.

The spelling of 165506617 in words is "one hundred sixty-five million, five hundred six thousand, six hundred seventeen".