9880658720856 has 720 divisors, whose sum is σ = 34802837531280. Its totient is φ = 2529877996800.

The previous prime is 9880658720833. The next prime is 9880658720869. The reversal of 9880658720856 is 6580278560889.

It is a super-2 number, since 2×9880658720856² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 1485140026 + ... + 1485146678.

It is an arithmetic number, because the mean of its divisors is an integer number (48337274349).

Almost surely, 2^{9880658720856} 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 9880658720856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17401418765640).

9880658720856 is an abundant number, since it is smaller than the sum of its proper divisors (24922178810424).

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

9880658720856 is a wasteful number, since it uses less digits than its factorization.

9880658720856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6786 (or 6747 counting only the distinct ones).

The product of its (nonzero) digits is 464486400, while the sum is 72.

The spelling of 9880658720856 in words is "nine trillion, eight hundred eighty billion, six hundred fifty-eight million, seven hundred twenty thousand, eight hundred fifty-six".