6518021040 has 120 divisors (see below), whose sum is σ = 21913270080. Its totient is φ = 1736266752.

The previous prime is 6518021039. The next prime is 6518021071. The reversal of 6518021040 is 401208156.

6518021040 is a `hidden beast` number, since 651 + 8 + 0 + 2 + 1 + 0 + 4 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 6518020995 and 6518021013.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 743724 + ... + 752436.

It is an arithmetic number, because the mean of its divisors is an integer number (182610584).

Almost surely, 2^6518021040 is an apocalyptic number.

6518021040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6518021040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10956635040).

6518021040 is an abundant number, since it is smaller than the sum of its proper divisors (15395249040).

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

6518021040 is a wasteful number, since it uses less digits than its factorization.

6518021040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9771 (or 9762 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 6518021040 is about 80734.2618718967. The cubic root of 6518021040 is about 1867.9786980561.

Adding to 6518021040 its reverse (401208156), we get a palindrome (6919229196).

The spelling of 6518021040 in words is "six billion, five hundred eighteen million, twenty-one thousand, forty".