9985555399 has 2 divisors, whose sum is σ = 9985555400. Its totient is φ = 9985555398.

The previous prime is 9985555379. The next prime is 9985555427. The reversal of 9985555399 is 9935555899.

It is a weak prime.

It is an emirp because it is prime and its reverse (9935555899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9985555399 - 2¹⁷ = 9985424327 is a prime.

It is a super-2 number, since 2×9985555399² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9985555379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4992777699 + 4992777700.

It is an arithmetic number, because the mean of its divisors is an integer number (4992777700).

Almost surely, 2^9985555399 is an apocalyptic number.

9985555399 is a deficient number, since it is larger than the sum of its proper divisors (1).

9985555399 is an equidigital number, since it uses as much as digits as its factorization.

9985555399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98415000, while the sum is 67.

The square root of 9985555399 is about 99927.7508953344. The cubic root of 9985555399 is about 2153.3968585200.

The spelling of 9985555399 in words is "nine billion, nine hundred eighty-five million, five hundred fifty-five thousand, three hundred ninety-nine".