11891816161 has 8 divisors (see below), whose sum is σ = 11934000000. Its totient is φ = 11849658240.

The previous prime is 11891816129. The next prime is 11891816173. The reversal of 11891816161 is 16161819811.

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

It is a cyclic number.

It is not a de Polignac number, because 11891816161 - 2⁵ = 11891816129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11891816191) 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, 1550865 + ... + 1558513.

It is an arithmetic number, because the mean of its divisors is an integer number (1491750000).

Almost surely, 2^11891816161 is an apocalyptic number.

It is an amenable number.

11891816161 is a deficient number, since it is larger than the sum of its proper divisors (42183839).

11891816161 is an equidigital number, since it uses as much as digits as its factorization.

11891816161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12959.

The product of its digits is 20736, while the sum is 43.

The spelling of 11891816161 in words is "eleven billion, eight hundred ninety-one million, eight hundred sixteen thousand, one hundred sixty-one".