9845806844191 has 2 divisors, whose sum is σ = 9845806844192. Its totient is φ = 9845806844190.

The previous prime is 9845806844149. The next prime is 9845806844219. The reversal of 9845806844191 is 1914486085489.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9845806844191 - 2²¹ = 9845804747039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9845806844131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4922903422095 + 4922903422096.

It is an arithmetic number, because the mean of its divisors is an integer number (4922903422096).

Almost surely, 2^{9845806844191} is an apocalyptic number.

9845806844191 is a deficient number, since it is larger than the sum of its proper divisors (1).

9845806844191 is an equidigital number, since it uses as much as digits as its factorization.

9845806844191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79626240, while the sum is 67.

The spelling of 9845806844191 in words is "nine trillion, eight hundred forty-five billion, eight hundred six million, eight hundred forty-four thousand, one hundred ninety-one".