2165820803 has 2 divisors, whose sum is σ = 2165820804. Its totient is φ = 2165820802.

The previous prime is 2165820751. The next prime is 2165820821. The reversal of 2165820803 is 3080285612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2165820803 - 2¹⁰ = 2165819779 is a prime.

It is not a weakly prime, because it can be changed into another prime (2165820103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082910401 + 1082910402.

It is an arithmetic number, because the mean of its divisors is an integer number (1082910402).

Almost surely, 2^2165820803 is an apocalyptic number.

2165820803 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165820803 is an equidigital number, since it uses as much as digits as its factorization.

2165820803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 2165820803 is about 46538.3798922996. The cubic root of 2165820803 is about 1293.8209336418.

The spelling of 2165820803 in words is "two billion, one hundred sixty-five million, eight hundred twenty thousand, eight hundred three".