165644162553 has 16 divisors (see below), whose sum is σ = 231125630976. Its totient is φ = 105323742480.

The previous prime is 165644162543. The next prime is 165644162569. The reversal of 165644162553 is 355261446561.

It is a happy number.

165644162553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165644162553 - 2²¹ = 165642065401 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165644162543) 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, 3435193 + ... + 3483078.

It is an arithmetic number, because the mean of its divisors is an integer number (14445351936).

Almost surely, 2^165644162553 is an apocalyptic number.

It is an amenable number.

165644162553 is a deficient number, since it is larger than the sum of its proper divisors (65481468423).

165644162553 is a wasteful number, since it uses less digits than its factorization.

165644162553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6918644.

The product of its digits is 2592000, while the sum is 48.

The spelling of 165644162553 in words is "one hundred sixty-five billion, six hundred forty-four million, one hundred sixty-two thousand, five hundred fifty-three".