2217165780 has 96 divisors (see below), whose sum is σ = 6444587520. Its totient is φ = 569134080.

The previous prime is 2217165773. The next prime is 2217165817. The reversal of 2217165780 is 875617122.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 165576 + ... + 178464.

It is an arithmetic number, because the mean of its divisors is an integer number (67131120).

Almost surely, 2^2217165780 is an apocalyptic number.

2217165780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2217165780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3222293760).

2217165780 is an abundant number, since it is smaller than the sum of its proper divisors (4227421740).

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

2217165780 is a wasteful number, since it uses less digits than its factorization.

2217165780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13009 (or 13007 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 2217165780 is about 47086.7898672228. The cubic root of 2217165780 is about 1303.9653636339.

The spelling of 2217165780 in words is "two billion, two hundred seventeen million, one hundred sixty-five thousand, seven hundred eighty".