9841994217551 has 2 divisors, whose sum is σ = 9841994217552. Its totient is φ = 9841994217550.

The previous prime is 9841994217533. The next prime is 9841994217553. The reversal of 9841994217551 is 1557124991489.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9841994217551 - 2⁶ = 9841994217487 is a prime.

Together with 9841994217553, 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 (9841994217553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4920997108775 + 4920997108776.

It is an arithmetic number, because the mean of its divisors is an integer number (4920997108776).

Almost surely, 2^{9841994217551} is an apocalyptic number.

9841994217551 is a deficient number, since it is larger than the sum of its proper divisors (1).

9841994217551 is an equidigital number, since it uses as much as digits as its factorization.

9841994217551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32659200, while the sum is 65.

The spelling of 9841994217551 in words is "nine trillion, eight hundred forty-one billion, nine hundred ninety-four million, two hundred seventeen thousand, five hundred fifty-one".