165493945 has 8 divisors (see below), whose sum is σ = 200043144. Its totient is φ = 131428224.

The previous prime is 165493921. The next prime is 165493957. The reversal of 165493945 is 549394561.

It can be written as a sum of positive squares in 4 ways, for example, as 11449 + 165482496 = 107^2 + 12864^2 .

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 165493945 - 2¹¹ = 165491897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165493895 and 165493904.

It is an unprimeable number.

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, 120114 + ... + 121483.

It is an arithmetic number, because the mean of its divisors is an integer number (25005393).

Almost surely, 2^165493945 is an apocalyptic number.

It is an amenable number.

165493945 is a deficient number, since it is larger than the sum of its proper divisors (34549199).

165493945 is a wasteful number, since it uses less digits than its factorization.

165493945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241739.

The product of its digits is 583200, while the sum is 46.

The square root of 165493945 is about 12864.4449938581. Note that the first 3 decimals coincide. The cubic root of 165493945 is about 549.0274216758.

The spelling of 165493945 in words is "one hundred sixty-five million, four hundred ninety-three thousand, nine hundred forty-five".