785065881617 has 2 divisors, whose sum is σ = 785065881618. Its totient is φ = 785065881616.

The previous prime is 785065881583. The next prime is 785065881647. The reversal of 785065881617 is 716188560587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 692849805376 + 92216076241 = 832376^2 + 303671^2 .

It is a cyclic number.

It is not a de Polignac number, because 785065881617 - 2¹⁰ = 785065880593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 785065881617.

It is not a weakly prime, because it can be changed into another prime (785065881647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392532940808 + 392532940809.

It is an arithmetic number, because the mean of its divisors is an integer number (392532940809).

Almost surely, 2^785065881617 is an apocalyptic number.

It is an amenable number.

785065881617 is a deficient number, since it is larger than the sum of its proper divisors (1).

785065881617 is an equidigital number, since it uses as much as digits as its factorization.

785065881617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22579200, while the sum is 62.

The spelling of 785065881617 in words is "seven hundred eighty-five billion, sixty-five million, eight hundred eighty-one thousand, six hundred seventeen".