161178196 has 6 divisors (see below), whose sum is σ = 282061850. Its totient is φ = 80589096.

The previous prime is 161178187. The next prime is 161178203. The reversal of 161178196 is 691871161.

It can be written as a sum of positive squares in only one way, i.e., 105884100 + 55294096 = 10290^2 + 7436^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 20147271 + ... + 20147278.

Almost surely, 2^161178196 is an apocalyptic number.

It is an amenable number.

161178196 is a deficient number, since it is larger than the sum of its proper divisors (120883654).

161178196 is a wasteful number, since it uses less digits than its factorization.

161178196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40294553 (or 40294551 counting only the distinct ones).

The product of its digits is 18144, while the sum is 40.

The square root of 161178196 is about 12695.5975046470. The cubic root of 161178196 is about 544.2128141190.

The spelling of 161178196 in words is "one hundred sixty-one million, one hundred seventy-eight thousand, one hundred ninety-six".