165609972503423 has 16 divisors (see below), whose sum is σ = 191274134958144. Its totient is φ = 140448041026560.

The previous prime is 165609972503387. The next prime is 165609972503447. The reversal of 165609972503423 is 324305279906561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 165609972503423 - 2⁶ = 165609972503359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165609972503023) 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, 32286788 + ... + 37062873.

It is an arithmetic number, because the mean of its divisors is an integer number (11954633434884).

Almost surely, 2^{165609972503423} is an apocalyptic number.

165609972503423 is a deficient number, since it is larger than the sum of its proper divisors (25664162454721).

165609972503423 is an equidigital number, since it uses as much as digits as its factorization.

165609972503423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69353282.

The product of its (nonzero) digits is 73483200, while the sum is 62.

The spelling of 165609972503423 in words is "one hundred sixty-five trillion, six hundred nine billion, nine hundred seventy-two million, five hundred three thousand, four hundred twenty-three".