778618989816877 has 12 divisors (see below), whose sum is σ = 858095548260160. Its totient is φ = 705967805549160.

The previous prime is 778618989816821. The next prime is 778618989816881.

778618989816877 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 778618989816877 - 2⁷ = 778618989816749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778618989816887) 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 in 11 ways as a sum of consecutive naturals, for example, 8489225493 + ... + 8489317210.

Almost surely, 2^{778618989816877} is an apocalyptic number.

It is an amenable number.

778618989816877 is a deficient number, since it is larger than the sum of its proper divisors (79476558443283).

778618989816877 is a wasteful number, since it uses less digits than its factorization.

778618989816877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16978543104 (or 16978543093 counting only the distinct ones).

The product of its digits is 229419122688, while the sum is 100.

The spelling of 778618989816877 in words is "seven hundred seventy-eight trillion, six hundred eighteen billion, nine hundred eighty-nine million, eight hundred sixteen thousand, eight hundred seventy-seven".