9817391240803 has 2 divisors, whose sum is σ = 9817391240804. Its totient is φ = 9817391240802.

The previous prime is 9817391240791. The next prime is 9817391240807. The reversal of 9817391240803 is 3080421937189.

It is a happy number.

9817391240803 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9817391240803 - 2²¹ = 9817389143651 is a prime.

It is not a weakly prime, because it can be changed into another prime (9817391240807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4908695620401 + 4908695620402.

It is an arithmetic number, because the mean of its divisors is an integer number (4908695620402).

Almost surely, 2^{9817391240803} is an apocalyptic number.

9817391240803 is a deficient number, since it is larger than the sum of its proper divisors (1).

9817391240803 is an equidigital number, since it uses as much as digits as its factorization.

9817391240803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 9817391240803 in words is "nine trillion, eight hundred seventeen billion, three hundred ninety-one million, two hundred forty thousand, eight hundred three".