2166133266 has 80 divisors (see below), whose sum is σ = 5573763360. Its totient is φ = 621846720.

The previous prime is 2166133259. The next prime is 2166133271. The reversal of 2166133266 is 6623316612.

2166133266 is a `hidden beast` number, since 2 + 1 + 6 + 613 + 32 + 6 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 2166133266.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1870 + ... + 65846.

It is an arithmetic number, because the mean of its divisors is an integer number (69672042).

Almost surely, 2^2166133266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2166133266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2786881680).

2166133266 is an abundant number, since it is smaller than the sum of its proper divisors (3407630094).

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

2166133266 is a wasteful number, since it uses less digits than its factorization.

2166133266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64021 (or 64012 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 2166133266 is about 46541.7368176135. The cubic root of 2166133266 is about 1293.8831505051.

Adding to 2166133266 its reverse (6623316612), we get a palindrome (8789449878).

The spelling of 2166133266 in words is "two billion, one hundred sixty-six million, one hundred thirty-three thousand, two hundred sixty-six".