161844468851 has 24 divisors (see below), whose sum is σ = 187124357376. Its totient is φ = 139576076640.

The previous prime is 161844468833. The next prime is 161844468857. The reversal of 161844468851 is 158864448161.

It is a de Polignac number, because none of the positive numbers 2^k-161844468851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161844468857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 317015 + ... + 651296.

It is an arithmetic number, because the mean of its divisors is an integer number (7796848224).

Almost surely, 2^161844468851 is an apocalyptic number.

161844468851 is a deficient number, since it is larger than the sum of its proper divisors (25279888525).

161844468851 is a wasteful number, since it uses less digits than its factorization.

161844468851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968403 (or 968390 counting only the distinct ones).

The product of its digits is 5898240, while the sum is 56.

The spelling of 161844468851 in words is "one hundred sixty-one billion, eight hundred forty-four million, four hundred sixty-eight thousand, eight hundred fifty-one".