8320216649 has 2 divisors, whose sum is σ = 8320216650. Its totient is φ = 8320216648.

The previous prime is 8320216637. The next prime is 8320216711. The reversal of 8320216649 is 9466120238.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7679367424 + 640849225 = 87632^2 + 25315^2 .

It is a cyclic number.

It is not a de Polignac number, because 8320216649 - 2²⁰ = 8319168073 is a prime.

It is not a weakly prime, because it can be changed into another prime (8320216249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4160108324 + 4160108325.

It is an arithmetic number, because the mean of its divisors is an integer number (4160108325).

Almost surely, 2^8320216649 is an apocalyptic number.

It is an amenable number.

8320216649 is a deficient number, since it is larger than the sum of its proper divisors (1).

8320216649 is an equidigital number, since it uses as much as digits as its factorization.

8320216649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 8320216649 is about 91215.2215860927. The cubic root of 8320216649 is about 2026.3363956265.

The spelling of 8320216649 in words is "eight billion, three hundred twenty million, two hundred sixteen thousand, six hundred forty-nine".