8387865866533 has 2 divisors, whose sum is σ = 8387865866534. Its totient is φ = 8387865866532.

The previous prime is 8387865866531. The next prime is 8387865866581. The reversal of 8387865866533 is 3356685687838.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5441778548644 + 2946087317889 = 2332762^2 + 1716417^2 .

It is a cyclic number.

It is not a de Polignac number, because 8387865866533 - 2¹ = 8387865866531 is a prime.

Together with 8387865866531, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 8387865866533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8387865866531) 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, 4193932933266 + 4193932933267.

It is an arithmetic number, because the mean of its divisors is an integer number (4193932933267).

Almost surely, 2^{8387865866533} is an apocalyptic number.

It is an amenable number.

8387865866533 is a deficient number, since it is larger than the sum of its proper divisors (1).

8387865866533 is an equidigital number, since it uses as much as digits as its factorization.

8387865866533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4180377600, while the sum is 76.

The spelling of 8387865866533 in words is "eight trillion, three hundred eighty-seven billion, eight hundred sixty-five million, eight hundred sixty-six thousand, five hundred thirty-three".