2191766850 has 480 divisors, whose sum is σ = 7914910080. Its totient is φ = 436700160.

The previous prime is 2191766749. The next prime is 2191766851. The reversal of 2191766850 is 586671912.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2191766796 and 2191766805.

It is not an unprimeable number, because it can be changed into a prime (2191766851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 7002294 + ... + 7002606.

It is an arithmetic number, because the mean of its divisors is an integer number (16489396).

Almost surely, 2^2191766850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191766850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3957455040).

2191766850 is an abundant number, since it is smaller than the sum of its proper divisors (5723143230).

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

2191766850 is a wasteful number, since it uses less digits than its factorization.

2191766850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 2191766850 is about 46816.3096580668. The cubic root of 2191766850 is about 1298.9669998924.

The spelling of 2191766850 in words is "two billion, one hundred ninety-one million, seven hundred sixty-six thousand, eight hundred fifty".