9866663687 has 2 divisors, whose sum is σ = 9866663688. Its totient is φ = 9866663686.

The previous prime is 9866663659. The next prime is 9866663689. The reversal of 9866663687 is 7863666689.

It is a strong prime.

It is an emirp because it is prime and its reverse (7863666689) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9866663687 - 2⁶ = 9866663623 is a prime.

Together with 9866663689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9866663689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4933331843 + 4933331844.

It is an arithmetic number, because the mean of its divisors is an integer number (4933331844).

Almost surely, 2^9866663687 is an apocalyptic number.

9866663687 is a deficient number, since it is larger than the sum of its proper divisors (1).

9866663687 is an equidigital number, since it uses as much as digits as its factorization.

9866663687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94058496, while the sum is 65.

The square root of 9866663687 is about 99331.0811730145. The cubic root of 9866663687 is about 2144.8163340367.

The spelling of 9866663687 in words is "nine billion, eight hundred sixty-six million, six hundred sixty-three thousand, six hundred eighty-seven".