6505000000 has 112 divisors (see below), whose sum is σ = 16147810224. Its totient is φ = 2600000000.

The previous prime is 6504999989. The next prime is 6505000009. The reversal of 6505000000 is 5056.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2706496576 + 3798503424 = 52024^2 + 61632^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (6505000009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4999350 + ... + 5000650.

It is an arithmetic number, because the mean of its divisors is an integer number (144176877).

Almost surely, 2^6505000000 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 6505000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8073905112).

6505000000 is an abundant number, since it is smaller than the sum of its proper divisors (9642810224).

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

6505000000 is an frugal number, since it uses more digits than its factorization.

6505000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348 (or 1308 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 6505000000 is about 80653.5802057168. The cubic root of 6505000000 is about 1866.7339828332.

Adding to 6505000000 its reverse (5056), we get a palindrome (6505005056).

The spelling of 6505000000 in words is "six billion, five hundred five million", and thus it is an aban number.