778761576855 has 40 divisors (see below), whose sum is σ = 1396659488400. Its totient is φ = 415143961344.

The previous prime is 778761576851. The next prime is 778761576863. The reversal of 778761576855 is 558675167877.

It is not a de Polignac number, because 778761576855 - 2² = 778761576851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778761576851) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 410656 + ... + 1313834.

It is an arithmetic number, because the mean of its divisors is an integer number (34916487210).

Almost surely, 2^778761576855 is an apocalyptic number.

778761576855 is a deficient number, since it is larger than the sum of its proper divisors (617897911545).

778761576855 is a wasteful number, since it uses less digits than its factorization.

778761576855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905325 (or 905316 counting only the distinct ones).

The product of its digits is 691488000, while the sum is 72.

The spelling of 778761576855 in words is "seven hundred seventy-eight billion, seven hundred sixty-one million, five hundred seventy-six thousand, eight hundred fifty-five".