9999785539858 has 8 divisors (see below), whose sum is σ = 15001768296252. Its totient is φ = 4999196107776.

The previous prime is 9999785539853. The next prime is 9999785539859. The reversal of 9999785539858 is 8589355879999.

It can be written as a sum of positive squares in 2 ways, for example, as 9998098548529 + 1686991329 = 3161977^2 + 41073^2 .

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

It is not an unprimeable number, because it can be changed into a prime (9999785539853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348313135 + ... + 348341842.

Almost surely, 2^{9999785539858} is an apocalyptic number.

9999785539858 is a deficient number, since it is larger than the sum of its proper divisors (5001982756394).

9999785539858 is a wasteful number, since it uses less digits than its factorization.

9999785539858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696662156.

The product of its digits is 79361856000, while the sum is 94.

The spelling of 9999785539858 in words is "nine trillion, nine hundred ninety-nine billion, seven hundred eighty-five million, five hundred thirty-nine thousand, eight hundred fifty-eight".