161118185 has 4 divisors (see below), whose sum is σ = 193341828. Its totient is φ = 128894544.

The previous prime is 161118179. The next prime is 161118193. The reversal of 161118185 is 581811161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95491984 + 65626201 = 9772^2 + 8101^2 .

It is a cyclic number.

It is not a de Polignac number, because 161118185 - 2¹⁰ = 161117161 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 16111814 + ... + 16111823.

It is an arithmetic number, because the mean of its divisors is an integer number (48335457).

Almost surely, 2^161118185 is an apocalyptic number.

It is an amenable number.

161118185 is a deficient number, since it is larger than the sum of its proper divisors (32223643).

161118185 is an equidigital number, since it uses as much as digits as its factorization.

161118185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32223642.

The product of its digits is 1920, while the sum is 32.

The square root of 161118185 is about 12693.2338275161. The cubic root of 161118185 is about 544.1452640200.

The spelling of 161118185 in words is "one hundred sixty-one million, one hundred eighteen thousand, one hundred eighty-five".