161885318 has 12 divisors (see below), whose sum is σ = 282473532. Its totient is φ = 69379380.

The previous prime is 161885303. The next prime is 161885351. The reversal of 161885318 is 813588161.

It is a super-2 number, since 2×161885318² = 52413712367922248, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 825848 + ... + 826043.

It is an arithmetic number, because the mean of its divisors is an integer number (23539461).

Almost surely, 2^161885318 is an apocalyptic number.

161885318 is a deficient number, since it is larger than the sum of its proper divisors (120588214).

161885318 is a wasteful number, since it uses less digits than its factorization.

161885318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651907 (or 1651900 counting only the distinct ones).

The product of its digits is 46080, while the sum is 41.

The square root of 161885318 is about 12723.4161293263. The cubic root of 161885318 is about 545.0075110487.

The spelling of 161885318 in words is "one hundred sixty-one million, eight hundred eighty-five thousand, three hundred eighteen".