9866199418771 has 2 divisors, whose sum is σ = 9866199418772. Its totient is φ = 9866199418770.

The previous prime is 9866199418727. The next prime is 9866199418847. The reversal of 9866199418771 is 1778149916689.

It is an a-pointer prime, because the next prime (9866199418847) can be obtained adding 9866199418771 to its sum of digits (76).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9866199418771 - 2²⁵ = 9866165864339 is a prime.

It is not a weakly prime, because it can be changed into another prime (9866199418871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4933099709385 + 4933099709386.

It is an arithmetic number, because the mean of its divisors is an integer number (4933099709386).

Almost surely, 2^{9866199418771} is an apocalyptic number.

9866199418771 is a deficient number, since it is larger than the sum of its proper divisors (1).

9866199418771 is an equidigital number, since it uses as much as digits as its factorization.

9866199418771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 329204736, while the sum is 76.

The spelling of 9866199418771 in words is "nine trillion, eight hundred sixty-six billion, one hundred ninety-nine million, four hundred eighteen thousand, seven hundred seventy-one".