161668185 has 32 divisors (see below), whose sum is σ = 305821440. Its totient is φ = 71355648.

The previous prime is 161668183. The next prime is 161668189. The reversal of 161668185 is 581866161.

161668185 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161668185 - 2¹ = 161668183 is a prime.

It is a super-2 number, since 2×161668185² = 52273204082388450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161668183) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23502 + ... + 29591.

It is an arithmetic number, because the mean of its divisors is an integer number (9556920).

Almost surely, 2^161668185 is an apocalyptic number.

161668185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161668185 is a deficient number, since it is larger than the sum of its proper divisors (144153255).

161668185 is a wasteful number, since it uses less digits than its factorization.

161668185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53137.

The product of its digits is 69120, while the sum is 42.

The square root of 161668185 is about 12714.8804555922. The cubic root of 161668185 is about 544.7637334056.

The spelling of 161668185 in words is "one hundred sixty-one million, six hundred sixty-eight thousand, one hundred eighty-five".