161611161 has 8 divisors (see below), whose sum is σ = 215555520. Its totient is φ = 107703792.

The previous prime is 161611159. The next prime is 161611181. The reversal of 161611161 is 161116161.

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

It is not a de Polignac number, because 161611161 - 2¹ = 161611159 is a prime.

It is a super-2 number, since 2×161611161² = 52236334719535842, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161611111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3435 + ... + 18303.

It is an arithmetic number, because the mean of its divisors is an integer number (26944440).

Almost surely, 2^161611161 is an apocalyptic number.

It is an amenable number.

161611161 is a deficient number, since it is larger than the sum of its proper divisors (53944359).

161611161 is a wasteful number, since it uses less digits than its factorization.

161611161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18495.

The product of its digits is 216, while the sum is 24.

The square root of 161611161 is about 12712.6378458603. The cubic root of 161611161 is about 544.6996757386.

The spelling of 161611161 in words is "one hundred sixty-one million, six hundred eleven thousand, one hundred sixty-one".