9666813553487 has 2 divisors, whose sum is σ = 9666813553488. Its totient is φ = 9666813553486.

The previous prime is 9666813553451. The next prime is 9666813553567. The reversal of 9666813553487 is 7843553186669.

It is a weak prime.

It is an emirp because it is prime and its reverse (7843553186669) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9666813553487 - 2¹⁰ = 9666813552463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9666813553487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9666813556487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4833406776743 + 4833406776744.

It is an arithmetic number, because the mean of its divisors is an integer number (4833406776744).

Almost surely, 2^{9666813553487} is an apocalyptic number.

9666813553487 is a deficient number, since it is larger than the sum of its proper divisors (1).

9666813553487 is an equidigital number, since it uses as much as digits as its factorization.

9666813553487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 783820800, while the sum is 71.

The spelling of 9666813553487 in words is "nine trillion, six hundred sixty-six billion, eight hundred thirteen million, five hundred fifty-three thousand, four hundred eighty-seven".