9999855144 has 48 divisors (see below), whose sum is σ = 27151237620. Its totient is φ = 3324879360.

The previous prime is 9999855143. The next prime is 9999855149. The reversal of 9999855144 is 4415589999.

It can be written as a sum of positive squares in 2 ways, for example, as 9998000100 + 1855044 = 99990^2 + 1362^2 .

It is not an unprimeable number, because it can be changed into a prime (9999855143) 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, 146337 + ... + 203504.

Almost surely, 2^9999855144 is an apocalyptic number.

It is an amenable number.

9999855144 is an abundant number, since it is smaller than the sum of its proper divisors (17151382476).

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

9999855144 is a wasteful number, since it uses less digits than its factorization.

9999855144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350250 (or 350243 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 63.

The square root of 9999855144 is about 99999.2757173771. The cubic root of 9999855144 is about 2154.4242872219.

It can be divided in two parts, 9999855 and 144, that added together give a palindrome (9999999).

The spelling of 9999855144 in words is "nine billion, nine hundred ninety-nine million, eight hundred fifty-five thousand, one hundred forty-four".