9985805069 has 2 divisors, whose sum is σ = 9985805070. Its totient is φ = 9985805068.

The previous prime is 9985805023. The next prime is 9985805099. The reversal of 9985805069 is 9605085899.

9985805069 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7993254025 + 1992551044 = 89405^2 + 44638^2 .

It is an emirp because it is prime and its reverse (9605085899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9985805069 - 2³² = 5690837773 is a prime.

It is a super-2 number, since 2×9985805069² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9985804999 and 9985805017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9985805099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4992902534 + 4992902535.

It is an arithmetic number, because the mean of its divisors is an integer number (4992902535).

Almost surely, 2^9985805069 is an apocalyptic number.

It is an amenable number.

9985805069 is a deficient number, since it is larger than the sum of its proper divisors (1).

9985805069 is an equidigital number, since it uses as much as digits as its factorization.

9985805069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6998400, while the sum is 59.

The square root of 9985805069 is about 99929.0001400995. Note that the first 3 decimals coincide. The cubic root of 9985805069 is about 2153.4148055809.

The spelling of 9985805069 in words is "nine billion, nine hundred eighty-five million, eight hundred five thousand, sixty-nine".