9999785539880 has 32 divisors (see below), whose sum is σ = 22807730039400. Its totient is φ = 3945120869376.

The previous prime is 9999785539879. The next prime is 9999785539921. The reversal of 9999785539880 is 889355879999.

It can be written as a sum of positive squares in 4 ways, for example, as 4999883825764 + 4999901714116 = 2236042^2 + 2236046^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1712289125 + ... + 1712294964.

Almost surely, 2^{9999785539880} is an apocalyptic number.

It is an amenable number.

9999785539880 is an abundant number, since it is smaller than the sum of its proper divisors (12807944499520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9999785539880 is a wasteful number, since it uses less digits than its factorization.

9999785539880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3424584173 (or 3424584169 counting only the distinct ones).

The product of its (nonzero) digits is 15872371200, while the sum is 89.

The spelling of 9999785539880 in words is "nine trillion, nine hundred ninety-nine billion, seven hundred eighty-five million, five hundred thirty-nine thousand, eight hundred eighty".