2166194320 has 20 divisors (see below), whose sum is σ = 5036401980. Its totient is φ = 866477696.

The previous prime is 2166194311. The next prime is 2166194321. The reversal of 2166194320 is 234916612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 361304064 + 1804890256 = 19008^2 + 42484^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (2166194321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13538635 + ... + 13538794.

It is an arithmetic number, because the mean of its divisors is an integer number (251820099).

Almost surely, 2^2166194320 is an apocalyptic number.

2166194320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166194320 is an abundant number, since it is smaller than the sum of its proper divisors (2870207660).

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

2166194320 is a wasteful number, since it uses less digits than its factorization.

2166194320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27077442 (or 27077436 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 2166194320 is about 46542.3927188966. The cubic root of 2166194320 is about 1293.8953067285.

The spelling of 2166194320 in words is "two billion, one hundred sixty-six million, one hundred ninety-four thousand, three hundred twenty".