161854612128 has 120 divisors (see below), whose sum is σ = 519283638720. Its totient is φ = 49046843520.

The previous prime is 161854612111. The next prime is 161854612169. The reversal of 161854612128 is 821216458161.

161854612128 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 5 + 4 + 612 + 1 + 28 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2809848 + ... + 2866871.

It is an arithmetic number, because the mean of its divisors is an integer number (4327363656).

Almost surely, 2^161854612128 is an apocalyptic number.

161854612128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161854612128 is an abundant number, since it is smaller than the sum of its proper divisors (357429026592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161854612128 is a wasteful number, since it uses less digits than its factorization.

161854612128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5676752 (or 5676735 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The spelling of 161854612128 in words is "one hundred sixty-one billion, eight hundred fifty-four million, six hundred twelve thousand, one hundred twenty-eight".