778611115878 has 16 divisors (see below), whose sum is σ = 1557232432560. Its totient is φ = 259535338496.

The previous prime is 778611115871. The next prime is 778611115903. The reversal of 778611115878 is 878511116877.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778611115871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 871438 + ... + 1522046.

It is an arithmetic number, because the mean of its divisors is an integer number (97327027035).

Almost surely, 2^778611115878 is an apocalyptic number.

778611115878 is an abundant number, since it is smaller than the sum of its proper divisors (778621316682).

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

778611115878 is a wasteful number, since it uses less digits than its factorization.

778611115878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850071.

The product of its digits is 5268480, while the sum is 60.

Subtracting 778611115878 from its reverse (878511116877), we obtain a palindrome (99900000999).

The spelling of 778611115878 in words is "seven hundred seventy-eight billion, six hundred eleven million, one hundred fifteen thousand, eight hundred seventy-eight".