165213142321623 has 16 divisors (see below), whose sum is σ = 240317425689600. Its totient is φ = 100126093625280.

The previous prime is 165213142321621. The next prime is 165213142321651. The reversal of 165213142321623 is 326123241312561.

It is not a de Polignac number, because 165213142321623 - 2¹ = 165213142321621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165213142321621) 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 in 15 ways as a sum of consecutive naturals, for example, 76000438 + ... + 78144051.

It is an arithmetic number, because the mean of its divisors is an integer number (15019839105600).

Almost surely, 2^{165213142321623} is an apocalyptic number.

165213142321623 is a deficient number, since it is larger than the sum of its proper divisors (75104283367977).

165213142321623 is a wasteful number, since it uses less digits than its factorization.

165213142321623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154176982.

The product of its digits is 311040, while the sum is 42.

The spelling of 165213142321623 in words is "one hundred sixty-five trillion, two hundred thirteen billion, one hundred forty-two million, three hundred twenty-one thousand, six hundred twenty-three".