9985555899 has 24 divisors (see below), whose sum is σ = 15770726400. Its totient is φ = 6038040240.

The previous prime is 9985555883. The next prime is 9985555907.

9985555899 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9985555899 - 2⁴ = 9985555883 is a prime.

It is a super-2 number, since 2×9985555899² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9985555399) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71419 + ... + 158340.

It is an arithmetic number, because the mean of its divisors is an integer number (657113600).

Almost surely, 2^9985555899 is an apocalyptic number.

9985555899 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

9985555899 is a deficient number, since it is larger than the sum of its proper divisors (5785170501).

9985555899 is a wasteful number, since it uses less digits than its factorization.

9985555899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230215 (or 230212 counting only the distinct ones).

The product of its digits is 262440000, while the sum is 72.

The square root of 9985555899 is about 99927.7533971419. The cubic root of 9985555899 is about 2153.3968944619.

The spelling of 9985555899 in words is "nine billion, nine hundred eighty-five million, five hundred fifty-five thousand, eight hundred ninety-nine".