617817263549 has 2 divisors, whose sum is σ = 617817263550. Its totient is φ = 617817263548.

The previous prime is 617817263513. The next prime is 617817263551. The reversal of 617817263549 is 945362718716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 473196779449 + 144620484100 = 687893^2 + 380290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-617817263549 is a prime.

It is a super-2 number, since 2×617817263549² (a number of 24 digits) contains 22 as substring.

Together with 617817263551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617817263579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308908631774 + 308908631775.

It is an arithmetic number, because the mean of its divisors is an integer number (308908631775).

Almost surely, 2^617817263549 is an apocalyptic number.

It is an amenable number.

617817263549 is a deficient number, since it is larger than the sum of its proper divisors (1).

617817263549 is an equidigital number, since it uses as much as digits as its factorization.

617817263549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15240960, while the sum is 59.

The spelling of 617817263549 in words is "six hundred seventeen billion, eight hundred seventeen million, two hundred sixty-three thousand, five hundred forty-nine".