9809086640556 has 144 divisors (see below), whose sum is σ = 28033954502400. Its totient is φ = 2654333926272.

The previous prime is 9809086640531. The next prime is 9809086640569. The reversal of 9809086640556 is 6550466809089.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39615385 + ... + 39862223.

It is an arithmetic number, because the mean of its divisors is an integer number (194680239600).

Almost surely, 2^{9809086640556} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9809086640556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14016977251200).

9809086640556 is an abundant number, since it is smaller than the sum of its proper divisors (18224867861844).

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

9809086640556 is a wasteful number, since it uses less digits than its factorization.

9809086640556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250436 (or 250427 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 66.

The spelling of 9809086640556 in words is "nine trillion, eight hundred nine billion, eighty-six million, six hundred forty thousand, five hundred fifty-six".