778189711556 has 12 divisors (see below), whose sum is σ = 1361893037568. Its totient is φ = 389077415112.

The previous prime is 778189711549. The next prime is 778189711643. The reversal of 778189711556 is 655117981877.

778189711556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×778189711556² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 778189711492 and 778189711501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4259516 + ... + 4438451.

It is an arithmetic number, because the mean of its divisors is an integer number (113491086464).

Almost surely, 2^778189711556 is an apocalyptic number.

It is an amenable number.

778189711556 is a deficient number, since it is larger than the sum of its proper divisors (583703326012).

778189711556 is a wasteful number, since it uses less digits than its factorization.

778189711556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8720338 (or 8720336 counting only the distinct ones).

The product of its digits is 29635200, while the sum is 65.

The spelling of 778189711556 in words is "seven hundred seventy-eight billion, one hundred eighty-nine million, seven hundred eleven thousand, five hundred fifty-six".