161945886 has 16 divisors (see below), whose sum is σ = 325321344. Its totient is φ = 53743704.

The previous prime is 161945881. The next prime is 161945909. The reversal of 161945886 is 688549161.

161945886 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 not an unprimeable number, because it can be changed into a prime (161945881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58090 + ... + 60813.

It is an arithmetic number, because the mean of its divisors is an integer number (20332584).

Almost surely, 2^161945886 is an apocalyptic number.

161945886 is an abundant number, since it is smaller than the sum of its proper divisors (163375458).

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

161945886 is a wasteful number, since it uses less digits than its factorization.

161945886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119135.

The product of its digits is 414720, while the sum is 48.

The square root of 161945886 is about 12725.7960851178. The cubic root of 161945886 is about 545.0754725320.

The spelling of 161945886 in words is "one hundred sixty-one million, nine hundred forty-five thousand, eight hundred eighty-six".