2191335066 has 32 divisors (see below), whose sum is σ = 4894128000. Its totient is φ = 726770880.

The previous prime is 2191335049. The next prime is 2191335079. The reversal of 2191335066 is 6605331912.

2191335066 is a `hidden beast` number, since 2 + 19 + 133 + 506 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 2191335066.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91215 + ... + 112706.

It is an arithmetic number, because the mean of its divisors is an integer number (152941500).

Almost surely, 2^2191335066 is an apocalyptic number.

2191335066 is an abundant number, since it is smaller than the sum of its proper divisors (2702792934).

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

2191335066 is a wasteful number, since it uses less digits than its factorization.

2191335066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204131 (or 204125 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 2191335066 is about 46811.6979610866. The cubic root of 2191335066 is about 1298.8816942857.

Adding to 2191335066 its reverse (6605331912), we get a palindrome (8796666978).

The spelling of 2191335066 in words is "two billion, one hundred ninety-one million, three hundred thirty-five thousand, sixty-six".