9902788718243 has 2 divisors, whose sum is σ = 9902788718244. Its totient is φ = 9902788718242.

The previous prime is 9902788718213. The next prime is 9902788718281. The reversal of 9902788718243 is 3428178872099.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9902788718243 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (9902788718203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4951394359121 + 4951394359122.

It is an arithmetic number, because the mean of its divisors is an integer number (4951394359122).

Almost surely, 2^{9902788718243} is an apocalyptic number.

9902788718243 is a deficient number, since it is larger than the sum of its proper divisors (1).

9902788718243 is an equidigital number, since it uses as much as digits as its factorization.

9902788718243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97542144, while the sum is 68.

The spelling of 9902788718243 in words is "nine trillion, nine hundred two billion, seven hundred eighty-eight million, seven hundred eighteen thousand, two hundred forty-three".