11891321166 has 16 divisors (see below), whose sum is σ = 23907161088. Its totient is φ = 3943020600.

The previous prime is 11891321131. The next prime is 11891321207. The reversal of 11891321166 is 66112319811.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5187040 + ... + 5189331.

It is an arithmetic number, because the mean of its divisors is an integer number (1494197568).

Almost surely, 2^11891321166 is an apocalyptic number.

11891321166 is an abundant number, since it is smaller than the sum of its proper divisors (12015839922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11891321166 is a wasteful number, since it uses less digits than its factorization.

11891321166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10376567.

The product of its digits is 15552, while the sum is 39.

The spelling of 11891321166 in words is "eleven billion, eight hundred ninety-one million, three hundred twenty-one thousand, one hundred sixty-six".