165043324521123 has 4 divisors (see below), whose sum is σ = 220057766028168. Its totient is φ = 110028883014080.

The previous prime is 165043324521029. The next prime is 165043324521133. The reversal of 165043324521123 is 321125423340561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165043324521123 - 2¹⁰ = 165043324520099 is a prime.

It is a super-2 number, since 2×165043324521123² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165043324521133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27507220753518 + ... + 27507220753523.

It is an arithmetic number, because the mean of its divisors is an integer number (55014441507042).

Almost surely, 2^{165043324521123} is an apocalyptic number.

165043324521123 is a deficient number, since it is larger than the sum of its proper divisors (55014441507045).

165043324521123 is an equidigital number, since it uses as much as digits as its factorization.

165043324521123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55014441507044.

The product of its (nonzero) digits is 518400, while the sum is 42.

Adding to 165043324521123 its reverse (321125423340561), we get a palindrome (486168747861684).

The spelling of 165043324521123 in words is "one hundred sixty-five trillion, forty-three billion, three hundred twenty-four million, five hundred twenty-one thousand, one hundred twenty-three".