9989394765408 has 192 divisors, whose sum is σ = 30672214272000. Its totient is φ = 3154235116032.

The previous prime is 9989394765377. The next prime is 9989394765421. The reversal of 9989394765408 is 8045674939899.

9989394765408 is a `hidden beast` number, since 9 + 9 + 8 + 93 + 9 + 476 + 54 + 0 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212711466 + ... + 212758422.

It is an arithmetic number, because the mean of its divisors is an integer number (159751116000).

Almost surely, 2^{9989394765408} 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 9989394765408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15336107136000).

9989394765408 is an abundant number, since it is smaller than the sum of its proper divisors (20682819506592).

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

9989394765408 is a wasteful number, since it uses less digits than its factorization.

9989394765408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59954 (or 59940 counting only the distinct ones).

The product of its (nonzero) digits is 4232632320, while the sum is 81.

The spelling of 9989394765408 in words is "nine trillion, nine hundred eighty-nine billion, three hundred ninety-four million, seven hundred sixty-five thousand, four hundred eight".