2211780660 has 48 divisors (see below), whose sum is σ = 6197083200. Its totient is φ = 589417984.

The previous prime is 2211780643. The next prime is 2211780667. The reversal of 2211780660 is 660871122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211780667) 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 15 ways as a sum of consecutive naturals, for example, 85756 + ... + 108524.

It is an arithmetic number, because the mean of its divisors is an integer number (129105900).

Almost surely, 2^2211780660 is an apocalyptic number.

2211780660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2211780660 is an abundant number, since it is smaller than the sum of its proper divisors (3985302540).

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

2211780660 is a wasteful number, since it uses less digits than its factorization.

2211780660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24400 (or 24398 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 2211780660 is about 47029.5721860193. The cubic root of 2211780660 is about 1302.9088041295.

The spelling of 2211780660 in words is "two billion, two hundred eleven million, seven hundred eighty thousand, six hundred sixty".