161853275846891 has 2 divisors, whose sum is σ = 161853275846892. Its totient is φ = 161853275846890.

The previous prime is 161853275846813. The next prime is 161853275846921. The reversal of 161853275846891 is 198648572358161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161853275846891 - 2¹⁴ = 161853275830507 is a prime.

It is not a weakly prime, because it can be changed into another prime (161853275846291) 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 as a sum of consecutive naturals, namely, 80926637923445 + 80926637923446.

It is an arithmetic number, because the mean of its divisors is an integer number (80926637923446).

Almost surely, 2^{161853275846891} is an apocalyptic number.

161853275846891 is a deficient number, since it is larger than the sum of its proper divisors (1).

161853275846891 is an equidigital number, since it uses as much as digits as its factorization.

161853275846891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 696729600, while the sum is 74.

The spelling of 161853275846891 in words is "one hundred sixty-one trillion, eight hundred fifty-three billion, two hundred seventy-five million, eight hundred forty-six thousand, eight hundred ninety-one".