5181818538780 has 240 divisors, whose sum is σ = 17716905559584. Its totient is φ = 1260156372480.

The previous prime is 5181818538763. The next prime is 5181818538803. The reversal of 5181818538780 is 878358181815.

5181818538780 is a `hidden beast` number, since 5 + 1 + 8 + 1 + 8 + 18 + 538 + 7 + 80 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 265750 + ... + 3230210.

Almost surely, 2^{5181818538780} 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 5181818538780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8858452779792).

5181818538780 is an abundant number, since it is smaller than the sum of its proper divisors (12535087020804).

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

5181818538780 is a wasteful number, since it uses less digits than its factorization.

5181818538780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2964578 (or 2964567 counting only the distinct ones).

The product of its (nonzero) digits is 17203200, while the sum is 63.

The spelling of 5181818538780 in words is "five trillion, one hundred eighty-one billion, eight hundred eighteen million, five hundred thirty-eight thousand, seven hundred eighty".