161188685 has 48 divisors (see below), whose sum is σ = 244707840. Its totient is φ = 101243520.

The previous prime is 161188681. The next prime is 161188697. The reversal of 161188685 is 586881161.

It is not a de Polignac number, because 161188685 - 2² = 161188681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161188681) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 143747 + ... + 144863.

It is an arithmetic number, because the mean of its divisors is an integer number (5098080).

Almost surely, 2^161188685 is an apocalyptic number.

It is an amenable number.

161188685 is a deficient number, since it is larger than the sum of its proper divisors (83519155).

161188685 is a wasteful number, since it uses less digits than its factorization.

161188685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186 (or 1179 counting only the distinct ones).

The product of its digits is 92160, while the sum is 44.

The square root of 161188685 is about 12696.0105938834. The cubic root of 161188685 is about 544.2246191160.

The spelling of 161188685 in words is "one hundred sixty-one million, one hundred eighty-eight thousand, six hundred eighty-five".