778494494877 has 24 divisors (see below), whose sum is σ = 1148080098528. Its totient is φ = 465351523200.

The previous prime is 778494494863. The next prime is 778494494881.

778494494877 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-778494494877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778494494857) 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 in 23 ways as a sum of consecutive naturals, for example, 2037574 + ... + 2389287.

It is an arithmetic number, because the mean of its divisors is an integer number (47836670772).

Almost surely, 2^778494494877 is an apocalyptic number.

It is an amenable number.

778494494877 is a deficient number, since it is larger than the sum of its proper divisors (369585603651).

778494494877 is a wasteful number, since it uses less digits than its factorization.

778494494877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4427021 (or 4426948 counting only the distinct ones).

The product of its digits is 3186376704, while the sum is 78.

The spelling of 778494494877 in words is "seven hundred seventy-eight billion, four hundred ninety-four million, four hundred ninety-four thousand, eight hundred seventy-seven".