8387865866531 has 2 divisors, whose sum is σ = 8387865866532. Its totient is φ = 8387865866530.

The previous prime is 8387865866491. The next prime is 8387865866533. The reversal of 8387865866531 is 1356685687838.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8387865866531 is a prime.

It is a super-2 number, since 2×8387865866531² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 8387865866533, 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 (8387865866533) 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, 4193932933265 + 4193932933266.

It is an arithmetic number, because the mean of its divisors is an integer number (4193932933266).

Almost surely, 2^{8387865866531} is an apocalyptic number.

8387865866531 is a deficient number, since it is larger than the sum of its proper divisors (1).

8387865866531 is an equidigital number, since it uses as much as digits as its factorization.

8387865866531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1393459200, while the sum is 74.

The spelling of 8387865866531 in words is "eight trillion, three hundred eighty-seven billion, eight hundred sixty-five million, eight hundred sixty-six thousand, five hundred thirty-one".