165345641 has 2 divisors, whose sum is σ = 165345642. Its totient is φ = 165345640.

The previous prime is 165345629. The next prime is 165345659. The reversal of 165345641 is 146543561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103958416 + 61387225 = 10196^2 + 7835^2 .

It is a cyclic number.

It is not a de Polignac number, because 165345641 - 2¹⁰ = 165344617 is a prime.

It is not a weakly prime, because it can be changed into another prime (165345601) 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 as a sum of consecutive naturals, namely, 82672820 + 82672821.

It is an arithmetic number, because the mean of its divisors is an integer number (82672821).

Almost surely, 2^165345641 is an apocalyptic number.

It is an amenable number.

165345641 is a deficient number, since it is larger than the sum of its proper divisors (1).

165345641 is an equidigital number, since it uses as much as digits as its factorization.

165345641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 35.

The square root of 165345641 is about 12858.6795978436. The cubic root of 165345641 is about 548.8633727802.

The spelling of 165345641 in words is "one hundred sixty-five million, three hundred forty-five thousand, six hundred forty-one".