165547239423 has 4 divisors (see below), whose sum is σ = 220729652568. Its totient is φ = 110364826280.

The previous prime is 165547239421. The next prime is 165547239433. The reversal of 165547239423 is 324932745561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324932745561 = 3 ⋅108310915187.

It is a cyclic number.

It is not a de Polignac number, because 165547239423 - 2¹ = 165547239421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165547239421) 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 3 ways as a sum of consecutive naturals, for example, 27591206568 + ... + 27591206573.

It is an arithmetic number, because the mean of its divisors is an integer number (55182413142).

Almost surely, 2^165547239423 is an apocalyptic number.

165547239423 is a deficient number, since it is larger than the sum of its proper divisors (55182413145).

165547239423 is an equidigital number, since it uses as much as digits as its factorization.

165547239423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55182413144.

The product of its digits is 5443200, while the sum is 51.

The spelling of 165547239423 in words is "one hundred sixty-five billion, five hundred forty-seven million, two hundred thirty-nine thousand, four hundred twenty-three".