9880406655840 has 1728 divisors, whose sum is σ = 43752508660224. Its totient is φ = 2013515513856.

The previous prime is 9880406655761. The next prime is 9880406655923. The reversal of 9880406655840 is 485566040889.

9880406655840 is a `hidden beast` number, since 9 + 8 + 8 + 0 + 40 + 6 + 6 + 5 + 584 + 0 = 666.

It is a super-2 number, since 2×9880406655840² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 2952017047 + ... + 2952020393.

It is an arithmetic number, because the mean of its divisors is an integer number (25319738808).

Almost surely, 2^{9880406655840} is an apocalyptic number.

9880406655840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9880406655840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21876254330112).

9880406655840 is an abundant number, since it is smaller than the sum of its proper divisors (33872102004384).

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

9880406655840 is a wasteful number, since it uses less digits than its factorization.

9880406655840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529 (or 3511 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 63.

The spelling of 9880406655840 in words is "nine trillion, eight hundred eighty billion, four hundred six million, six hundred fifty-five thousand, eight hundred forty".