2166044166 has 128 divisors (see below), whose sum is σ = 5726407680. Its totient is φ = 605711520.

The previous prime is 2166044143. The next prime is 2166044207. The reversal of 2166044166 is 6614406612.

2166044166 is a `hidden beast` number, since 2 + 1 + 6 + 604 + 41 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 2166044166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 623751 + ... + 627213.

It is an arithmetic number, because the mean of its divisors is an integer number (44737560).

Almost surely, 2^2166044166 is an apocalyptic number.

2166044166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166044166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2863203840).

2166044166 is an abundant number, since it is smaller than the sum of its proper divisors (3560363514).

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

2166044166 is a wasteful number, since it uses less digits than its factorization.

2166044166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510 (or 3492 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 2166044166 is about 46540.7796024089. The cubic root of 2166044166 is about 1293.8654097423.

The spelling of 2166044166 in words is "two billion, one hundred sixty-six million, forty-four thousand, one hundred sixty-six".