165243604440517 has 2 divisors, whose sum is σ = 165243604440518. Its totient is φ = 165243604440516.

The previous prime is 165243604440491. The next prime is 165243604440547. The reversal of 165243604440517 is 715044406342561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102088572924321 + 63155031516196 = 10103889^2 + 7947014^2 .

It is an emirp because it is prime and its reverse (715044406342561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165243604440517 - 2³¹ = 165241456956869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165243604440547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82621802220258 + 82621802220259.

It is an arithmetic number, because the mean of its divisors is an integer number (82621802220259).

Almost surely, 2^{165243604440517} is an apocalyptic number.

It is an amenable number.

165243604440517 is a deficient number, since it is larger than the sum of its proper divisors (1).

165243604440517 is an equidigital number, since it uses as much as digits as its factorization.

165243604440517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9676800, while the sum is 52.

The spelling of 165243604440517 in words is "one hundred sixty-five trillion, two hundred forty-three billion, six hundred four million, four hundred forty thousand, five hundred seventeen".