9981398213952 has 224 divisors, whose sum is σ = 29715635873664. Its totient is φ = 2930282496000.

The previous prime is 9981398213933. The next prime is 9981398214101. The reversal of 9981398213952 is 2593128931899.

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, 17933452 + ... + 18481652.

Almost surely, 2^{9981398213952} 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 9981398213952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14857817936832).

9981398213952 is an abundant number, since it is smaller than the sum of its proper divisors (19734237659712).

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

9981398213952 is a wasteful number, since it uses less digits than its factorization.

9981398213952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548497 (or 548487 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 69.

The spelling of 9981398213952 in words is "nine trillion, nine hundred eighty-one billion, three hundred ninety-eight million, two hundred thirteen thousand, nine hundred fifty-two".