78600785617 has 2 divisors, whose sum is σ = 78600785618. Its totient is φ = 78600785616.

The previous prime is 78600785597. The next prime is 78600785633. The reversal of 78600785617 is 71658700687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66435578001 + 12165207616 = 257751^2 + 110296^2 .

It is a cyclic number.

It is not a de Polignac number, because 78600785617 - 2¹⁹ = 78600261329 is a prime.

It is not a weakly prime, because it can be changed into another prime (78600785657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39300392808 + 39300392809.

It is an arithmetic number, because the mean of its divisors is an integer number (39300392809).

Almost surely, 2^78600785617 is an apocalyptic number.

It is an amenable number.

78600785617 is a deficient number, since it is larger than the sum of its proper divisors (1).

78600785617 is an equidigital number, since it uses as much as digits as its factorization.

78600785617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3951360, while the sum is 55.

The spelling of 78600785617 in words is "seventy-eight billion, six hundred million, seven hundred eighty-five thousand, six hundred seventeen".