161885958 has 64 divisors (see below), whose sum is σ = 360364032. Its totient is φ = 48165120.

The previous prime is 161885957. The next prime is 161885963. The reversal of 161885958 is 859588161.

It is a self number, because there is not a number n which added to its sum of digits gives 161885958.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161885953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 713041 + ... + 713267.

It is an arithmetic number, because the mean of its divisors is an integer number (5630688).

Almost surely, 2^161885958 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161885958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180182016).

161885958 is an abundant number, since it is smaller than the sum of its proper divisors (198478074).

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

161885958 is a wasteful number, since it uses less digits than its factorization.

161885958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509.

The product of its digits is 691200, while the sum is 51.

The square root of 161885958 is about 12723.4412797796. The cubic root of 161885958 is about 545.0082292616.

The spelling of 161885958 in words is "one hundred sixty-one million, eight hundred eighty-five thousand, nine hundred fifty-eight".