165363665 has 8 divisors (see below), whose sum is σ = 198526248. Its totient is φ = 132231040.

The previous prime is 165363659. The next prime is 165363677. The reversal of 165363665 is 566363561.

It can be written as a sum of positive squares in 4 ways, for example, as 36336784 + 129026881 = 6028^2 + 11359^2 .

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

It is not a de Polignac number, because 165363665 - 2¹⁰ = 165362641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7325 + ... + 19605.

It is an arithmetic number, because the mean of its divisors is an integer number (24815781).

Almost surely, 2^165363665 is an apocalyptic number.

It is an amenable number.

165363665 is a deficient number, since it is larger than the sum of its proper divisors (33162583).

165363665 is a wasteful number, since it uses less digits than its factorization.

165363665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14979.

The product of its digits is 291600, while the sum is 41.

The square root of 165363665 is about 12859.3804283099. The cubic root of 165363665 is about 548.8833155577.

The spelling of 165363665 in words is "one hundred sixty-five million, three hundred sixty-three thousand, six hundred sixty-five".