161946918 has 64 divisors (see below), whose sum is σ = 432960000. Its totient is φ = 43833312.

The previous prime is 161946893. The next prime is 161946929. The reversal of 161946918 is 819649161.

161946918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4093 + ... + 18456.

It is an arithmetic number, because the mean of its divisors is an integer number (6765000).

Almost surely, 2^161946918 is an apocalyptic number.

161946918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161946918 is an abundant number, since it is smaller than the sum of its proper divisors (271013082).

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

161946918 is a wasteful number, since it uses less digits than its factorization.

161946918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22586 (or 22580 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 161946918 is about 12725.8366326148. The cubic root of 161946918 is about 545.0766303605.

The spelling of 161946918 in words is "one hundred sixty-one million, nine hundred forty-six thousand, nine hundred eighteen".