2165222400217 has 2 divisors, whose sum is σ = 2165222400218. Its totient is φ = 2165222400216.

The previous prime is 2165222400193. The next prime is 2165222400283. The reversal of 2165222400217 is 7120042225612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2053543454361 + 111678945856 = 1433019^2 + 334184^2 .

It is a cyclic number.

It is not a de Polignac number, because 2165222400217 - 2¹¹ = 2165222398169 is a prime.

It is not a weakly prime, because it can be changed into another prime (2165222400017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082611200108 + 1082611200109.

It is an arithmetic number, because the mean of its divisors is an integer number (1082611200109).

Almost surely, 2^{2165222400217} is an apocalyptic number.

It is an amenable number.

2165222400217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165222400217 is an equidigital number, since it uses as much as digits as its factorization.

2165222400217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 34.

Adding to 2165222400217 its reverse (7120042225612), we get a palindrome (9285264625829).

The spelling of 2165222400217 in words is "two trillion, one hundred sixty-five billion, two hundred twenty-two million, four hundred thousand, two hundred seventeen".