165924145 has 8 divisors (see below), whose sum is σ = 199178856. Its totient is φ = 132692736.

The previous prime is 165924133. The next prime is 165924149. The reversal of 165924145 is 541429561.

It can be written as a sum of positive squares in 4 ways, for example, as 1648656 + 164275489 = 1284^2 + 12817^2 .

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 165924145 - 2¹⁷ = 165793073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165924149) 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, 21529 + ... + 28201.

It is an arithmetic number, because the mean of its divisors is an integer number (24897357).

Almost surely, 2^165924145 is an apocalyptic number.

It is an amenable number.

165924145 is a deficient number, since it is larger than the sum of its proper divisors (33254711).

165924145 is an equidigital number, since it uses as much as digits as its factorization.

165924145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11651.

The product of its digits is 43200, while the sum is 37.

The square root of 165924145 is about 12881.1546454501. The cubic root of 165924145 is about 549.5027406420.

The spelling of 165924145 in words is "one hundred sixty-five million, nine hundred twenty-four thousand, one hundred forty-five".