9981159552 has 640 divisors, whose sum is σ = 37322208000. Its totient is φ = 2577899520.

The previous prime is 9981159533. The next prime is 9981159569. The reversal of 9981159552 is 2559511899.

9981159552 is a `hidden beast` number, since 9 + 9 + 81 + 1 + 5 + 9 + 552 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 66987574 + ... + 66987722.

It is an arithmetic number, because the mean of its divisors is an integer number (58315950).

Almost surely, 2^9981159552 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 9981159552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18661104000).

9981159552 is an abundant number, since it is smaller than the sum of its proper divisors (27341048448).

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

9981159552 is a wasteful number, since it uses less digits than its factorization.

9981159552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 245 counting only the distinct ones).

The product of its digits is 1458000, while the sum is 54.

The square root of 9981159552 is about 99905.7533478428. The cubic root of 9981159552 is about 2153.0808222682.

The spelling of 9981159552 in words is "nine billion, nine hundred eighty-one million, one hundred fifty-nine thousand, five hundred fifty-two".