165565747565539 has 2 divisors, whose sum is σ = 165565747565540. Its totient is φ = 165565747565538.

The previous prime is 165565747565527. The next prime is 165565747565671. The reversal of 165565747565539 is 935565747565561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165565747565539 - 2⁹ = 165565747565027 is a prime.

It is not a weakly prime, because it can be changed into another prime (165565747565039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82782873782769 + 82782873782770.

It is an arithmetic number, because the mean of its divisors is an integer number (82782873782770).

Almost surely, 2^{165565747565539} is an apocalyptic number.

165565747565539 is a deficient number, since it is larger than the sum of its proper divisors (1).

165565747565539 is an equidigital number, since it uses as much as digits as its factorization.

165565747565539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17860500000, while the sum is 79.

The spelling of 165565747565539 in words is "one hundred sixty-five trillion, five hundred sixty-five billion, seven hundred forty-seven million, five hundred sixty-five thousand, five hundred thirty-nine".