161885994 has 8 divisors (see below), whose sum is σ = 323772000. Its totient is φ = 53961996.

The previous prime is 161885993. The next prime is 161886007. The reversal of 161885994 is 499588161.

161885994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

161885994 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (161885993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13490494 + ... + 13490505.

It is an arithmetic number, because the mean of its divisors is an integer number (40471500).

Almost surely, 2^161885994 is an apocalyptic number.

161885994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161885994 is a wasteful number, since it uses less digits than its factorization.

161885994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26981004.

The product of its digits is 622080, while the sum is 51.

The square root of 161885994 is about 12723.4426944911. The cubic root of 161885994 is about 545.0082696610.

The spelling of 161885994 in words is "one hundred sixty-one million, eight hundred eighty-five thousand, nine hundred ninety-four".