985718591593 has 2 divisors, whose sum is σ = 985718591594. Its totient is φ = 985718591592.

The previous prime is 985718591591. The next prime is 985718591621. The reversal of 985718591593 is 395195817589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 704068671744 + 281649919849 = 839088^2 + 530707^2 .

It is a cyclic number.

It is not a de Polignac number, because 985718591593 - 2¹ = 985718591591 is a prime.

It is a super-2 number, since 2×985718591593² (a number of 25 digits) contains 22 as substring.

Together with 985718591591, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (985718591591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492859295796 + 492859295797.

It is an arithmetic number, because the mean of its divisors is an integer number (492859295797).

Almost surely, 2^985718591593 is an apocalyptic number.

It is an amenable number.

985718591593 is a deficient number, since it is larger than the sum of its proper divisors (1).

985718591593 is an equidigital number, since it uses as much as digits as its factorization.

985718591593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472000, while the sum is 70.

The spelling of 985718591593 in words is "nine hundred eighty-five billion, seven hundred eighteen million, five hundred ninety-one thousand, five hundred ninety-three".