8218563497 has 2 divisors, whose sum is σ = 8218563498. Its totient is φ = 8218563496.

The previous prime is 8218563427. The next prime is 8218563499. The reversal of 8218563497 is 7943658128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4945464976 + 3273098521 = 70324^2 + 57211^2 .

It is a cyclic number.

It is not a de Polignac number, because 8218563497 - 2²² = 8214369193 is a prime.

It is a super-3 number, since 3×8218563497³ (a number of 31 digits) contains 333 as substring.

Together with 8218563499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8218563499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4109281748 + 4109281749.

It is an arithmetic number, because the mean of its divisors is an integer number (4109281749).

Almost surely, 2^8218563497 is an apocalyptic number.

It is an amenable number.

8218563497 is a deficient number, since it is larger than the sum of its proper divisors (1).

8218563497 is an equidigital number, since it uses as much as digits as its factorization.

8218563497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The square root of 8218563497 is about 90656.2932012996. The cubic root of 8218563497 is about 2018.0502292815.

The spelling of 8218563497 in words is "eight billion, two hundred eighteen million, five hundred sixty-three thousand, four hundred ninety-seven".