5518181520 has 120 divisors (see below), whose sum is σ = 18570240000. Its totient is φ = 1468470528.

The previous prime is 5518181507. The next prime is 5518181527. The reversal of 5518181520 is 251818155.

5518181520 is a `hidden beast` number, since 5 + 51 + 8 + 1 + 81 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (5518181527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351601 + ... + 366959.

It is an arithmetic number, because the mean of its divisors is an integer number (154752000).

Almost surely, 2^5518181520 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 5518181520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9285120000).

5518181520 is an abundant number, since it is smaller than the sum of its proper divisors (13052058480).

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

5518181520 is a wasteful number, since it uses less digits than its factorization.

5518181520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15877 (or 15868 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 36.

The square root of 5518181520 is about 74284.4635169428. The cubic root of 5518181520 is about 1767.1170919069.

Adding to 5518181520 its reverse (251818155), we get a palindrome (5769999675).

The spelling of 5518181520 in words is "five billion, five hundred eighteen million, one hundred eighty-one thousand, five hundred twenty".