165305172423 has 16 divisors (see below), whose sum is σ = 223215257600. Its totient is φ = 108799498080.

The previous prime is 165305172421. The next prime is 165305172443. The reversal of 165305172423 is 324271503561.

It is not a de Polignac number, because 165305172423 - 2¹ = 165305172421 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 (165305172421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4101138 + ... + 4141248.

It is an arithmetic number, because the mean of its divisors is an integer number (13950953600).

Almost surely, 2^165305172423 is an apocalyptic number.

165305172423 is a deficient number, since it is larger than the sum of its proper divisors (57910085177).

165305172423 is a wasteful number, since it uses less digits than its factorization.

165305172423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57582.

The product of its (nonzero) digits is 151200, while the sum is 39.

Adding to 165305172423 its reverse (324271503561), we get a palindrome (489576675984).

The spelling of 165305172423 in words is "one hundred sixty-five billion, three hundred five million, one hundred seventy-two thousand, four hundred twenty-three".