2165557760 has 40 divisors (see below), whose sum is σ = 5192269236. Its totient is φ = 866222080.

The previous prime is 2165557753. The next prime is 2165557769. The reversal of 2165557760 is 677555612.

It can be written as a sum of positive squares in 2 ways, for example, as 2121892096 + 43665664 = 46064^2 + 6608^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (2165557769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420401 + ... + 425520.

Almost surely, 2^2165557760 is an apocalyptic number.

2165557760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165557760 is an abundant number, since it is smaller than the sum of its proper divisors (3026711476).

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

2165557760 is an frugal number, since it uses more digits than its factorization.

2165557760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845944 (or 845928 counting only the distinct ones).

The product of its (nonzero) digits is 441000, while the sum is 44.

The square root of 2165557760 is about 46535.5537197098. The cubic root of 2165557760 is about 1293.7685525279.

The spelling of 2165557760 in words is "two billion, one hundred sixty-five million, five hundred fifty-seven thousand, seven hundred sixty".