8138919855780 has 576 divisors, whose sum is σ = 30554916940800. Its totient is φ = 1791219225600.

The previous prime is 8138919855697. The next prime is 8138919855791. The reversal of 8138919855780 is 875589198318.

8138919855780 is a `hidden beast` number, since 8 + 1 + 38 + 9 + 19 + 8 + 5 + 578 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 8138919855699 and 8138919855708.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 281599330 + ... + 281628230.

It is an arithmetic number, because the mean of its divisors is an integer number (53046730800).

Almost surely, 2^{8138919855780} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8138919855780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15277458470400).

8138919855780 is an abundant number, since it is smaller than the sum of its proper divisors (22415997085020).

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

8138919855780 is a wasteful number, since it uses less digits than its factorization.

8138919855780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29329 (or 29314 counting only the distinct ones).

The product of its (nonzero) digits is 174182400, while the sum is 72.

The spelling of 8138919855780 in words is "eight trillion, one hundred thirty-eight billion, nine hundred nineteen million, eight hundred fifty-five thousand, seven hundred eighty".