2166511164 has 12 divisors (see below), whose sum is σ = 5055192744. Its totient is φ = 722170384.

The previous prime is 2166511153. The next prime is 2166511189. The reversal of 2166511164 is 4611156612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90271287 + ... + 90271310.

It is an arithmetic number, because the mean of its divisors is an integer number (421266062).

Almost surely, 2^2166511164 is an apocalyptic number.

It is an amenable number.

2166511164 is an abundant number, since it is smaller than the sum of its proper divisors (2888681580).

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

2166511164 is a wasteful number, since it uses less digits than its factorization.

2166511164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180542604 (or 180542602 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 2166511164 is about 46545.7964160030. The cubic root of 2166511164 is about 1293.9583886312.

Adding to 2166511164 its reverse (4611156612), we get a palindrome (6777667776).

The spelling of 2166511164 in words is "two billion, one hundred sixty-six million, five hundred eleven thousand, one hundred sixty-four".