161886159 has 6 divisors (see below), whose sum is σ = 233835576. Its totient is φ = 107924100.

The previous prime is 161886157. The next prime is 161886169. The reversal of 161886159 is 951688161.

161886159 is a `hidden beast` number, since 16 + 18 + 8 + 615 + 9 = 666.

It is not a de Polignac number, because 161886159 - 2¹ = 161886157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161886157) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 8993667 + ... + 8993684.

It is an arithmetic number, because the mean of its divisors is an integer number (38972596).

Almost surely, 2^161886159 is an apocalyptic number.

161886159 is a deficient number, since it is larger than the sum of its proper divisors (71949417).

161886159 is a wasteful number, since it uses less digits than its factorization.

161886159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17987357 (or 17987354 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 161886159 is about 12723.4491785836. The cubic root of 161886159 is about 545.0084548249.

The spelling of 161886159 in words is "one hundred sixty-one million, eight hundred eighty-six thousand, one hundred fifty-nine".