165545553511 has 16 divisors (see below), whose sum is σ = 189771573600. Its totient is φ = 143141948928.

The previous prime is 165545553491. The next prime is 165545553521. The reversal of 165545553511 is 115355545561.

165545553511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 165545553511 - 2⁵ = 165545553479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165545553521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3743326 + ... + 3787291.

It is an arithmetic number, because the mean of its divisors is an integer number (11860723350).

Almost surely, 2^165545553511 is an apocalyptic number.

165545553511 is a deficient number, since it is larger than the sum of its proper divisors (24226020089).

165545553511 is a wasteful number, since it uses less digits than its factorization.

165545553511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7530738.

The product of its digits is 1125000, while the sum is 46.

The spelling of 165545553511 in words is "one hundred sixty-five billion, five hundred forty-five million, five hundred fifty-three thousand, five hundred eleven".