161844006871 has 4 divisors (see below), whose sum is σ = 164897667432. Its totient is φ = 158790346312.

The previous prime is 161844006869. The next prime is 161844006887. The reversal of 161844006871 is 178600448161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178600448161 = 15101 ⋅11827061.

It is a cyclic number.

It is not a de Polignac number, because 161844006871 - 2¹ = 161844006869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161844006851) 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, 1526830201 + ... + 1526830306.

It is an arithmetic number, because the mean of its divisors is an integer number (41224416858).

Almost surely, 2^161844006871 is an apocalyptic number.

161844006871 is a deficient number, since it is larger than the sum of its proper divisors (3053660561).

161844006871 is an equidigital number, since it uses as much as digits as its factorization.

161844006871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053660560.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 161844006871 in words is "one hundred sixty-one billion, eight hundred forty-four million, six thousand, eight hundred seventy-one".