9866199418847 has 2 divisors, whose sum is σ = 9866199418848. Its totient is φ = 9866199418846.

The previous prime is 9866199418771. The next prime is 9866199418871. The reversal of 9866199418847 is 7488149916689.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9866199418847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9866199411847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4933099709423 + 4933099709424.

It is an arithmetic number, because the mean of its divisors is an integer number (4933099709424).

Almost surely, 2^{9866199418847} is an apocalyptic number.

9866199418847 is a deficient number, since it is larger than the sum of its proper divisors (1).

9866199418847 is an equidigital number, since it uses as much as digits as its factorization.

9866199418847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1504935936, while the sum is 80.

The spelling of 9866199418847 in words is "nine trillion, eight hundred sixty-six billion, one hundred ninety-nine million, four hundred eighteen thousand, eight hundred forty-seven".