163506551323 has 4 divisors (see below), whose sum is σ = 163519037280. Its totient is φ = 163494065368.

The previous prime is 163506551317. The next prime is 163506551353. The reversal of 163506551323 is 323155605361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 323155605361 = 139423 ⋅2317807.

It is a cyclic number.

It is not a de Polignac number, because 163506551323 - 2⁹ = 163506550811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163506551353) 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, 6223315 + ... + 6249532.

It is an arithmetic number, because the mean of its divisors is an integer number (40879759320).

Almost surely, 2^163506551323 is an apocalyptic number.

163506551323 is a deficient number, since it is larger than the sum of its proper divisors (12485957).

163506551323 is a wasteful number, since it uses less digits than its factorization.

163506551323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12485956.

The product of its (nonzero) digits is 243000, while the sum is 40.

The spelling of 163506551323 in words is "one hundred sixty-three billion, five hundred six million, five hundred fifty-one thousand, three hundred twenty-three".