78218374173678 has 24 divisors (see below), whose sum is σ = 169953237949248. Its totient is φ = 25998930790272.

The previous prime is 78218374173677. The next prime is 78218374173707. The reversal of 78218374173678 is 87637147381287.

It is a happy number.

78218374173678 is a `hidden beast` number, since 7 + 8 + 2 + 18 + 374 + 173 + 6 + 78 = 666.

It is a super-2 number, since 2×78218374173678² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78218374173677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6155043550 + ... + 6155056257.

It is an arithmetic number, because the mean of its divisors is an integer number (7081384914552).

Almost surely, 2^{78218374173678} is an apocalyptic number.

78218374173678 is an abundant number, since it is smaller than the sum of its proper divisors (91734863775570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78218374173678 is a wasteful number, since it uses less digits than its factorization.

78218374173678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12310100168 (or 12310100165 counting only the distinct ones).

The product of its digits is 531062784, while the sum is 72.

The spelling of 78218374173678 in words is "seventy-eight trillion, two hundred eighteen billion, three hundred seventy-four million, one hundred seventy-three thousand, six hundred seventy-eight".