6520500000 has 840 divisors, whose sum is σ = 28585884096. Its totient is φ = 1425600000.

The previous prime is 6520499989. The next prime is 6520500001. The reversal of 6520500000 is 50256.

It is a tau number, because it is divible by the number of its divisors (840).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (6520500001) by changing a digit.

It is a polite number, since it can be written in 139 ways as a sum of consecutive naturals, for example, 283499989 + ... + 283500011.

Almost surely, 2^6520500000 is an apocalyptic number.

6520500000 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 6520500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14292942048).

6520500000 is an abundant number, since it is smaller than the sum of its proper divisors (22065384096).

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

6520500000 is an frugal number, since it uses more digits than its factorization.

6520500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 6520500000 is about 80749.6130021686. The cubic root of 6520500000 is about 1868.2154804333.

Adding to 6520500000 its reverse (50256), we get a palindrome (6520550256).

The spelling of 6520500000 in words is "six billion, five hundred twenty million, five hundred thousand".