778806878812 has 12 divisors (see below), whose sum is σ = 1422169083216. Its totient is φ = 372472855040.

The previous prime is 778806878767. The next prime is 778806878819. The reversal of 778806878812 is 218878608877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778806878819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4232645989 + ... + 4232646172.

It is an arithmetic number, because the mean of its divisors is an integer number (118514090268).

Almost surely, 2^778806878812 is an apocalyptic number.

It is an amenable number.

778806878812 is a deficient number, since it is larger than the sum of its proper divisors (643362204404).

778806878812 is a wasteful number, since it uses less digits than its factorization.

778806878812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8465292188 (or 8465292186 counting only the distinct ones).

The product of its (nonzero) digits is 134873088, while the sum is 70.

The spelling of 778806878812 in words is "seven hundred seventy-eight billion, eight hundred six million, eight hundred seventy-eight thousand, eight hundred twelve".