165745441 has 2 divisors, whose sum is σ = 165745442. Its totient is φ = 165745440.

The previous prime is 165745421. The next prime is 165745487. The reversal of 165745441 is 144547561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101425041 + 64320400 = 10071^2 + 8020^2 .

It is a cyclic number.

It is not a de Polignac number, because 165745441 - 2²⁵ = 132191009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165745441.

It is not a weakly prime, because it can be changed into another prime (165745421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82872720 + 82872721.

It is an arithmetic number, because the mean of its divisors is an integer number (82872721).

Almost surely, 2^165745441 is an apocalyptic number.

It is an amenable number.

165745441 is a deficient number, since it is larger than the sum of its proper divisors (1).

165745441 is an equidigital number, since it uses as much as digits as its factorization.

165745441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 37.

The square root of 165745441 is about 12874.2161314777. The cubic root of 165745441 is about 549.3053942124.

The spelling of 165745441 in words is "one hundred sixty-five million, seven hundred forty-five thousand, four hundred forty-one".