78817866144878 has 16 divisors (see below), whose sum is σ = 135604126597344. Its totient is φ = 33657139332000.

The previous prime is 78817866144869. The next prime is 78817866144887. The reversal of 78817866144878 is 87844166871887.

It is an interprime number because it is at equal distance from previous prime (78817866144869) and next prime (78817866144887).

It is a junction number, because it is equal to n+sod(n) for n = 78817866144796 and 78817866144805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10162175873 + ... + 10162183628.

It is an arithmetic number, because the mean of its divisors is an integer number (8475257912334).

Almost surely, 2^{78817866144878} is an apocalyptic number.

78817866144878 is a deficient number, since it is larger than the sum of its proper divisors (56786260452466).

78817866144878 is a wasteful number, since it uses less digits than its factorization.

78817866144878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20324359787.

The product of its digits is 6473908224, while the sum is 83.

The spelling of 78817866144878 in words is "seventy-eight trillion, eight hundred seventeen billion, eight hundred sixty-six million, one hundred forty-four thousand, eight hundred seventy-eight".