9929909556 has 120 divisors (see below), whose sum is σ = 30391010496. Its totient is φ = 2767893120.

The previous prime is 9929909543. The next prime is 9929909569. The reversal of 9929909556 is 6559099299.

It is an interprime number because it is at equal distance from previous prime (9929909543) and next prime (9929909569).

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

It is a junction number, because it is equal to n+sod(n) for n = 9929909493 and 9929909502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 39595 + ... + 146381.

Almost surely, 2^9929909556 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 9929909556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15195505248).

9929909556 is an abundant number, since it is smaller than the sum of its proper divisors (20461100940).

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

9929909556 is a wasteful number, since it uses less digits than its factorization.

9929909556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106851 (or 106840 counting only the distinct ones).

The product of its (nonzero) digits is 17714700, while the sum is 63.

The square root of 9929909556 is about 99648.9315346632. The cubic root of 9929909556 is about 2149.3893745274.

The spelling of 9929909556 in words is "nine billion, nine hundred twenty-nine million, nine hundred nine thousand, five hundred fifty-six".