165405359 has 8 divisors (see below), whose sum is σ = 200154528. Its totient is φ = 133436160.

The previous prime is 165405353. The next prime is 165405403. The reversal of 165405359 is 953504561.

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 165405359 - 2²⁴ = 148628143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165405353) 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, 694862 + ... + 695099.

It is an arithmetic number, because the mean of its divisors is an integer number (25019316).

Almost surely, 2^165405359 is an apocalyptic number.

165405359 is a deficient number, since it is larger than the sum of its proper divisors (34749169).

165405359 is a wasteful number, since it uses less digits than its factorization.

165405359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389985.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 165405359 is about 12861.0014773345. The cubic root of 165405359 is about 548.9294426152.

Subtracting from 165405359 its sum of digits (38), we obtain a square (165405321 = 12861²).

The spelling of 165405359 in words is "one hundred sixty-five million, four hundred five thousand, three hundred fifty-nine".