985255784593 has 2 divisors, whose sum is σ = 985255784594. Its totient is φ = 985255784592.

The previous prime is 985255784581. The next prime is 985255784663. The reversal of 985255784593 is 395487552589.

It is an a-pointer prime, because the next prime (985255784663) can be obtained adding 985255784593 to its sum of digits (70).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 623583446929 + 361672337664 = 789673^2 + 601392^2 .

It is an emirp because it is prime and its reverse (395487552589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985255784593 - 2⁵ = 985255784561 is a prime.

It is a super-2 number, since 2×985255784593² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (985255784573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492627892296 + 492627892297.

It is an arithmetic number, because the mean of its divisors is an integer number (492627892297).

Almost surely, 2^985255784593 is an apocalyptic number.

It is an amenable number.

985255784593 is a deficient number, since it is larger than the sum of its proper divisors (1).

985255784593 is an equidigital number, since it uses as much as digits as its factorization.

985255784593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320000, while the sum is 70.

The spelling of 985255784593 in words is "nine hundred eighty-five billion, two hundred fifty-five million, seven hundred eighty-four thousand, five hundred ninety-three".