9985805023 has 2 divisors, whose sum is σ = 9985805024. Its totient is φ = 9985805022.

The previous prime is 9985805021. The next prime is 9985805069. The reversal of 9985805023 is 3205085899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9985805023 - 2¹ = 9985805021 is a prime.

Together with 9985805021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9985805021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4992902511 + 4992902512.

It is an arithmetic number, because the mean of its divisors is an integer number (4992902512).

Almost surely, 2^9985805023 is an apocalyptic number.

9985805023 is a deficient number, since it is larger than the sum of its proper divisors (1).

9985805023 is an equidigital number, since it uses as much as digits as its factorization.

9985805023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 49.

The square root of 9985805023 is about 99928.9999099361. Note that the first 4 decimals coincide. The cubic root of 9985805023 is about 2153.4148022743.

The spelling of 9985805023 in words is "nine billion, nine hundred eighty-five million, eight hundred five thousand, twenty-three".