9999785539871 has 8 divisors (see below), whose sum is σ = 10009629557760. Its totient is φ = 9989945480952.

The previous prime is 9999785539859. The next prime is 9999785539879. The reversal of 9999785539871 is 1789355879999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9999785539871 - 2³⁸ = 9724907632927 is a prime.

It is a super-4 number, since 4×9999785539871⁴ (a number of 53 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999785539879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4077206 + ... + 6051708.

It is an arithmetic number, because the mean of its divisors is an integer number (1251203694720).

Almost surely, 2^{9999785539871} is an apocalyptic number.

9999785539871 is a deficient number, since it is larger than the sum of its proper divisors (9844017889).

9999785539871 is a wasteful number, since it uses less digits than its factorization.

9999785539871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979485.

The product of its digits is 13888324800, while the sum is 89.

The spelling of 9999785539871 in words is "nine trillion, nine hundred ninety-nine billion, seven hundred eighty-five million, five hundred thirty-nine thousand, eight hundred seventy-one".