9979534732440 has 1024 divisors, whose sum is σ = 39562267852800. Its totient is φ = 1957461811200.

The previous prime is 9979534732439. The next prime is 9979534732507. The reversal of 9979534732440 is 442374359799.

It is a super-2 number, since 2×9979534732440² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 887932341 + ... + 887943579.

It is an arithmetic number, because the mean of its divisors is an integer number (38635027200).

Almost surely, 2^{9979534732440} 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 9979534732440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19781133926400).

9979534732440 is an abundant number, since it is smaller than the sum of its proper divisors (29582733120360).

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

9979534732440 is a wasteful number, since it uses less digits than its factorization.

9979534732440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11408 (or 11404 counting only the distinct ones).

The product of its (nonzero) digits is 205752960, while the sum is 66.

The spelling of 9979534732440 in words is "nine trillion, nine hundred seventy-nine billion, five hundred thirty-four million, seven hundred thirty-two thousand, four hundred forty".