878785796617 has 2 divisors, whose sum is σ = 878785796618. Its totient is φ = 878785796616.

The previous prime is 878785796561. The next prime is 878785796639. The reversal of 878785796617 is 716697587878.

878785796617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529036567801 + 349749228816 = 727349^2 + 591396^2 .

It is a cyclic number.

It is not a de Polignac number, because 878785796617 - 2¹¹ = 878785794569 is a prime.

It is not a weakly prime, because it can be changed into another prime (878785796017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439392898308 + 439392898309.

It is an arithmetic number, because the mean of its divisors is an integer number (439392898309).

Almost surely, 2^878785796617 is an apocalyptic number.

It is an amenable number.

878785796617 is a deficient number, since it is larger than the sum of its proper divisors (1).

878785796617 is an equidigital number, since it uses as much as digits as its factorization.

878785796617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1991485440, while the sum is 79.

The spelling of 878785796617 in words is "eight hundred seventy-eight billion, seven hundred eighty-five million, seven hundred ninety-six thousand, six hundred seventeen".