9899860993 has 12 divisors (see below), whose sum is σ = 11256899220. Its totient is φ = 8689530080.

The previous prime is 9899860987. The next prime is 9899861011. The reversal of 9899860993 is 3990689989.

9899860993 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6611641344 + 3288219649 = 81312^2 + 57343^2 .

It is not a de Polignac number, because 9899860993 - 2⁵ = 9899860961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9899860913) 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, 1407130 + ... + 1414147.

It is an arithmetic number, because the mean of its divisors is an integer number (938074935).

Almost surely, 2^9899860993 is an apocalyptic number.

It is an amenable number.

9899860993 is a deficient number, since it is larger than the sum of its proper divisors (1357038227).

9899860993 is a wasteful number, since it uses less digits than its factorization.

9899860993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2821328 (or 2821317 counting only the distinct ones).

The product of its (nonzero) digits is 68024448, while the sum is 70.

The square root of 9899860993 is about 99498.0451717520. The cubic root of 9899860993 is about 2147.2191191441.

The spelling of 9899860993 in words is "nine billion, eight hundred ninety-nine million, eight hundred sixty thousand, nine hundred ninety-three".