878785796639 has 2 divisors, whose sum is σ = 878785796640. Its totient is φ = 878785796638.

The previous prime is 878785796617. The next prime is 878785796683. The reversal of 878785796639 is 936697587878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 878785796639 - 2¹² = 878785792543 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878785796039) 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, 439392898319 + 439392898320.

It is an arithmetic number, because the mean of its divisors is an integer number (439392898320).

Almost surely, 2^878785796639 is an apocalyptic number.

878785796639 is a deficient number, since it is larger than the sum of its proper divisors (1).

878785796639 is an equidigital number, since it uses as much as digits as its factorization.

878785796639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7681443840, while the sum is 83.

The spelling of 878785796639 in words is "eight hundred seventy-eight billion, seven hundred eighty-five million, seven hundred ninety-six thousand, six hundred thirty-nine".