617982078397 has 2 divisors, whose sum is σ = 617982078398. Its totient is φ = 617982078396.

The previous prime is 617982078361. The next prime is 617982078403. The reversal of 617982078397 is 793870289716.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 406037858521 + 211944219876 = 637211^2 + 460374^2 .

It is a cyclic number.

It is not a de Polignac number, because 617982078397 - 2¹⁹ = 617981554109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617982072397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308991039198 + 308991039199.

It is an arithmetic number, because the mean of its divisors is an integer number (308991039199).

Almost surely, 2^617982078397 is an apocalyptic number.

It is an amenable number.

617982078397 is a deficient number, since it is larger than the sum of its proper divisors (1).

617982078397 is an equidigital number, since it uses as much as digits as its factorization.

617982078397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64012032, while the sum is 67.

The spelling of 617982078397 in words is "six hundred seventeen billion, nine hundred eighty-two million, seventy-eight thousand, three hundred ninety-seven".