9999785539859 has 2 divisors, whose sum is σ = 9999785539860. Its totient is φ = 9999785539858.

The previous prime is 9999785539853. The next prime is 9999785539879. The reversal of 9999785539859 is 9589355879999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9999785539859 - 2²⁰ = 9999784491283 is a prime.

It is not a weakly prime, because it can be changed into another prime (9999785539853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999892769929 + 4999892769930.

It is an arithmetic number, because the mean of its divisors is an integer number (4999892769930).

Almost surely, 2^{9999785539859} is an apocalyptic number.

9999785539859 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999785539859 is an equidigital number, since it uses as much as digits as its factorization.

9999785539859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 89282088000, while the sum is 95.

The spelling of 9999785539859 in words is "nine trillion, nine hundred ninety-nine billion, seven hundred eighty-five million, five hundred thirty-nine thousand, eight hundred fifty-nine".