9999555552 has 72 divisors (see below), whose sum is σ = 32498562096. Its totient is φ = 2857015296.

The previous prime is 9999555551. The next prime is 9999555613. The reversal of 9999555552 is 2555559999.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×9999555552² (a number of 21 digits) contains 22 as substring.

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

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9999555552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999555551) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2478033 + ... + 2482064.

It is an arithmetic number, because the mean of its divisors is an integer number (451368918).

Almost surely, 2^9999555552 is an apocalyptic number.

It is an amenable number.

9999555552 is an abundant number, since it is smaller than the sum of its proper divisors (22499006544).

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

9999555552 is a wasteful number, since it uses less digits than its factorization.

9999555552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4960120 (or 4960109 counting only the distinct ones).

The product of its digits is 41006250, while the sum is 63.

The square root of 9999555552 is about 99997.7777353077. Note that the first 4 decimals coincide. The cubic root of 9999555552 is about 2154.4027717527.

The spelling of 9999555552 in words is "nine billion, nine hundred ninety-nine million, five hundred fifty-five thousand, five hundred fifty-two".