25220323217 has 2 divisors, whose sum is σ = 25220323218. Its totient is φ = 25220323216.

The previous prime is 25220323211. The next prime is 25220323229. The reversal of 25220323217 is 71232302252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17001812881 + 8218510336 = 130391^2 + 90656^2 .

It is a cyclic number.

It is not a de Polignac number, because 25220323217 - 2¹² = 25220319121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25220323217.

It is not a weakly prime, because it can be changed into another prime (25220323211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610161608 + 12610161609.

It is an arithmetic number, because the mean of its divisors is an integer number (12610161609).

Almost surely, 2^25220323217 is an apocalyptic number.

It is an amenable number.

25220323217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25220323217 is an equidigital number, since it uses as much as digits as its factorization.

25220323217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 29.

Adding to 25220323217 its reverse (71232302252), we get a palindrome (96452625469).

The spelling of 25220323217 in words is "twenty-five billion, two hundred twenty million, three hundred twenty-three thousand, two hundred seventeen".