9999555112 has 8 divisors (see below), whose sum is σ = 18749165850. Its totient is φ = 4999777552.

The previous prime is 9999555107. The next prime is 9999555119. The reversal of 9999555112 is 2115559999.

It can be written as a sum of positive squares in only one way, i.e., 7290768996 + 2708786116 = 85386^2 + 52046^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×9999555112² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (9999555119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624972187 + ... + 624972202.

Almost surely, 2^9999555112 is an apocalyptic number.

It is an amenable number.

9999555112 is a deficient number, since it is larger than the sum of its proper divisors (8749610738).

9999555112 is a wasteful number, since it uses less digits than its factorization.

9999555112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249944395 (or 1249944391 counting only the distinct ones).

The product of its digits is 1640250, while the sum is 55.

The square root of 9999555112 is about 99997.7755352588. The cubic root of 9999555112 is about 2154.4027401534.

The spelling of 9999555112 in words is "nine billion, nine hundred ninety-nine million, five hundred fifty-five thousand, one hundred twelve".