161128872823 has 4 divisors (see below), whose sum is σ = 161223157080. Its totient is φ = 161034588568.

The previous prime is 161128872811. The next prime is 161128872833. The reversal of 161128872823 is 328278821161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328278821161 = 46147 ⋅7113763.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161128872823 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 (161128872833) 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, 47139565 + ... + 47142982.

It is an arithmetic number, because the mean of its divisors is an integer number (40305789270).

Almost surely, 2^161128872823 is an apocalyptic number.

161128872823 is a deficient number, since it is larger than the sum of its proper divisors (94284257).

161128872823 is an equidigital number, since it uses as much as digits as its factorization.

161128872823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94284256.

The product of its digits is 516096, while the sum is 49.

The spelling of 161128872823 in words is "one hundred sixty-one billion, one hundred twenty-eight million, eight hundred seventy-two thousand, eight hundred twenty-three".