165555941 has 8 divisors (see below), whose sum is σ = 169176600. Its totient is φ = 161953792.

The previous prime is 165555937. The next prime is 165555967. The reversal of 165555941 is 149555561.

It can be written as a sum of positive squares in 4 ways, for example, as 1331716 + 164224225 = 1154^2 + 12815^2 .

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 165555941 - 2² = 165555937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165551941) 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, 14285 + ... + 23133.

It is an arithmetic number, because the mean of its divisors is an integer number (21147075).

Almost surely, 2^165555941 is an apocalyptic number.

It is an amenable number.

165555941 is a deficient number, since it is larger than the sum of its proper divisors (3620659).

165555941 is an equidigital number, since it uses as much as digits as its factorization.

165555941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9255.

The product of its digits is 135000, while the sum is 41.

The square root of 165555941 is about 12866.8543552805. The cubic root of 165555941 is about 549.0959705173.

The spelling of 165555941 in words is "one hundred sixty-five million, five hundred fifty-five thousand, nine hundred forty-one".