11778347878 has 24 divisors (see below), whose sum is σ = 19483051896. Its totient is φ = 5336321760.

The previous prime is 11778347849. The next prime is 11778347891. The reversal of 11778347878 is 87874387711.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4975 + ... + 153562.

It is an arithmetic number, because the mean of its divisors is an integer number (811793829).

Almost surely, 2^11778347878 is an apocalyptic number.

11778347878 is a deficient number, since it is larger than the sum of its proper divisors (7704704018).

11778347878 is a wasteful number, since it uses less digits than its factorization.

11778347878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158868 (or 158857 counting only the distinct ones).

The product of its digits is 14751744, while the sum is 61.

The spelling of 11778347878 in words is "eleven billion, seven hundred seventy-eight million, three hundred forty-seven thousand, eight hundred seventy-eight".