161878923912 has 16 divisors (see below), whose sum is σ = 404697309840. Its totient is φ = 53959641296.

The previous prime is 161878923889. The next prime is 161878923949. The reversal of 161878923912 is 219329878161.

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 3 ways as a sum of consecutive naturals, for example, 3372477558 + ... + 3372477605.

It is an arithmetic number, because the mean of its divisors is an integer number (25293581865).

Almost surely, 2^161878923912 is an apocalyptic number.

161878923912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161878923912 is an abundant number, since it is smaller than the sum of its proper divisors (242818385928).

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

161878923912 is a wasteful number, since it uses less digits than its factorization.

161878923912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6744955172 (or 6744955168 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 57.

The spelling of 161878923912 in words is "one hundred sixty-one billion, eight hundred seventy-eight million, nine hundred twenty-three thousand, nine hundred twelve".