9985799999 has 16 divisors (see below), whose sum is σ = 12427238400. Its totient is φ = 7829154144.

The previous prime is 9985799917. The next prime is 9985800029. The reversal of 9985799999 is 9999975899.

It is not a de Polignac number, because 9985799999 - 2¹⁶ = 9985734463 is a prime.

It is a Duffinian number.

9985799999 is a modest number, since divided by 99999 gives 99857 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9985796999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1290647 + ... + 1298360.

It is an arithmetic number, because the mean of its divisors is an integer number (776702400).

Almost surely, 2^9985799999 is an apocalyptic number.

9985799999 is a deficient number, since it is larger than the sum of its proper divisors (2441438401).

9985799999 is a wasteful number, since it uses less digits than its factorization.

9985799999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589062.

The product of its digits is 1339231320, while the sum is 83.

The square root of 9985799999 is about 99928.9747720850. The cubic root of 9985799999 is about 2153.4144411364.

The spelling of 9985799999 in words is "nine billion, nine hundred eighty-five million, seven hundred ninety-nine thousand, nine hundred ninety-nine".