161871432872 has 16 divisors (see below), whose sum is σ = 308653156800. Its totient is φ = 79563924400.

The previous prime is 161871432869. The next prime is 161871432893. The reversal of 161871432872 is 278234178161.

It is a self number, because there is not a number n which added to its sum of digits gives 161871432872.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171473504 + ... + 171474447.

It is an arithmetic number, because the mean of its divisors is an integer number (19290822300).

Almost surely, 2^161871432872 is an apocalyptic number.

It is an amenable number.

161871432872 is a deficient number, since it is larger than the sum of its proper divisors (146781723928).

161871432872 is a wasteful number, since it uses less digits than its factorization.

161871432872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342948016 (or 342948012 counting only the distinct ones).

The product of its digits is 903168, while the sum is 50.

The spelling of 161871432872 in words is "one hundred sixty-one billion, eight hundred seventy-one million, four hundred thirty-two thousand, eight hundred seventy-two".