776939945778 has 24 divisors (see below), whose sum is σ = 1685136309948. Its totient is φ = 258708223872.

The previous prime is 776939945773. The next prime is 776939945779. The reversal of 776939945778 is 877549939677.

776939945778 is a `hidden beast` number, since 7 + 7 + 6 + 9 + 3 + 99 + 457 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 722630905929 + 54309039849 = 850077^2 + 233043^2 .

It is a junction number, because it is equal to n+sod(n) for n = 776939945697 and 776939945706.

It is not an unprimeable number, because it can be changed into a prime (776939945773) 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, 22628875 + ... + 22663182.

Almost surely, 2^776939945778 is an apocalyptic number.

776939945778 is an abundant number, since it is smaller than the sum of its proper divisors (908196364170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

776939945778 is a wasteful number, since it uses less digits than its factorization.

776939945778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45293018 (or 45293015 counting only the distinct ones).

The product of its digits is 5040947520, while the sum is 81.

The spelling of 776939945778 in words is "seven hundred seventy-six billion, nine hundred thirty-nine million, nine hundred forty-five thousand, seven hundred seventy-eight".