165505547 has 2 divisors, whose sum is σ = 165505548. Its totient is φ = 165505546.

The previous prime is 165505537. The next prime is 165505573. The reversal of 165505547 is 745505561.

It is a weak prime.

It is an emirp because it is prime and its reverse (745505561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165505547 - 2¹⁰ = 165504523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165505547.

It is not a weakly prime, because it can be changed into another prime (165505507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82752773 + 82752774.

It is an arithmetic number, because the mean of its divisors is an integer number (82752774).

Almost surely, 2^165505547 is an apocalyptic number.

165505547 is a deficient number, since it is larger than the sum of its proper divisors (1).

165505547 is an equidigital number, since it uses as much as digits as its factorization.

165505547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105000, while the sum is 38.

The square root of 165505547 is about 12864.8959187395. The cubic root of 165505547 is about 549.0402512838.

The spelling of 165505547 in words is "one hundred sixty-five million, five hundred five thousand, five hundred forty-seven".