78215819996178 has 96 divisors (see below), whose sum is σ = 181416732307200. Its totient is φ = 24280254338400.

The previous prime is 78215819996147. The next prime is 78215819996179. The reversal of 78215819996178 is 87169991851287.

78215819996178 is a `hidden beast` number, since 7 + 8 + 21 + 581 + 9 + 9 + 9 + 6 + 1 + 7 + 8 = 666.

It is a super-2 number, since 2×78215819996178² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78215819996097 and 78215819996106.

It is not an unprimeable number, because it can be changed into a prime (78215819996179) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 854109133 + ... + 854200703.

It is an arithmetic number, because the mean of its divisors is an integer number (1889757628200).

Almost surely, 2^{78215819996178} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78215819996178, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90708366153600).

78215819996178 is an abundant number, since it is smaller than the sum of its proper divisors (103200912311022).

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

78215819996178 is a wasteful number, since it uses less digits than its factorization.

78215819996178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133988 (or 133985 counting only the distinct ones).

The product of its digits is 1097349120, while the sum is 81.

The spelling of 78215819996178 in words is "seventy-eight trillion, two hundred fifteen billion, eight hundred nineteen million, nine hundred ninety-six thousand, one hundred seventy-eight".