8245668217 has 2 divisors, whose sum is σ = 8245668218. Its totient is φ = 8245668216.

The previous prime is 8245668149. The next prime is 8245668239. The reversal of 8245668217 is 7128665428.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4651785616 + 3593882601 = 68204^2 + 59949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8245668217 is a prime.

It is a super-4 number, since 4×8245668217⁴ (a number of 41 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (8245668247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4122834108 + 4122834109.

It is an arithmetic number, because the mean of its divisors is an integer number (4122834109).

Almost surely, 2^8245668217 is an apocalyptic number.

It is an amenable number.

8245668217 is a deficient number, since it is larger than the sum of its proper divisors (1).

8245668217 is an equidigital number, since it uses as much as digits as its factorization.

8245668217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 49.

The square root of 8245668217 is about 90805.6618113650. The cubic root of 8245668217 is about 2020.2662963797.

The spelling of 8245668217 in words is "eight billion, two hundred forty-five million, six hundred sixty-eight thousand, two hundred seventeen".