78865740424556 has 24 divisors (see below), whose sum is σ = 139237248353280. Its totient is φ = 39083673629952.

The previous prime is 78865740424477. The next prime is 78865740424567. The reversal of 78865740424556 is 65542404756887.

It is a self number, because there is not a number n which added to its sum of digits gives 78865740424556.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94521365 + ... + 95352083.

It is an arithmetic number, because the mean of its divisors is an integer number (5801552014720).

Almost surely, 2^{78865740424556} is an apocalyptic number.

It is an amenable number.

78865740424556 is a deficient number, since it is larger than the sum of its proper divisors (60371507928724).

78865740424556 is a wasteful number, since it uses less digits than its factorization.

78865740424556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040873 (or 1040871 counting only the distinct ones).

The product of its (nonzero) digits is 1806336000, while the sum is 71.

The spelling of 78865740424556 in words is "seventy-eight trillion, eight hundred sixty-five billion, seven hundred forty million, four hundred twenty-four thousand, five hundred fifty-six".