11161211161 has 8 divisors (see below), whose sum is σ = 11829016224. Its totient is φ = 10494657600.

The previous prime is 11161211143. The next prime is 11161211167. The reversal of 11161211161 is 16111216111.

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

It is not a de Polignac number, because 11161211161 - 2⁵ = 11161211129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11161211167) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 294475 + ... + 330208.

It is an arithmetic number, because the mean of its divisors is an integer number (1478627028).

Almost surely, 2^11161211161 is an apocalyptic number.

It is an amenable number.

11161211161 is a deficient number, since it is larger than the sum of its proper divisors (667805063).

11161211161 is a wasteful number, since it uses less digits than its factorization.

11161211161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625751.

The product of its digits is 72, while the sum is 22.

Multiplying 11161211161 by its sum of digits (22), we get a palindrome (245546645542).

Adding to 11161211161 its reverse (16111216111), we get a palindrome (27272427272).

The spelling of 11161211161 in words is "eleven billion, one hundred sixty-one million, two hundred eleven thousand, one hundred sixty-one".