8320217687 has 2 divisors, whose sum is σ = 8320217688. Its totient is φ = 8320217686.

The previous prime is 8320217683. The next prime is 8320217747. The reversal of 8320217687 is 7867120238.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8320217687 - 2² = 8320217683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8320217681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4160108843 + 4160108844.

It is an arithmetic number, because the mean of its divisors is an integer number (4160108844).

Almost surely, 2^8320217687 is an apocalyptic number.

8320217687 is a deficient number, since it is larger than the sum of its proper divisors (1).

8320217687 is an equidigital number, since it uses as much as digits as its factorization.

8320217687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 8320217687 is about 91215.2272759324. The cubic root of 8320217687 is about 2026.3364798926.

The spelling of 8320217687 in words is "eight billion, three hundred twenty million, two hundred seventeen thousand, six hundred eighty-seven".