6501720330 has 72 divisors (see below), whose sum is σ = 19664400132. Its totient is φ = 1486106496.

The previous prime is 6501720299. The next prime is 6501720331. The reversal of 6501720330 is 330271056.

It is a happy number.

6501720330 is a `hidden beast` number, since 650 + 1 + 7 + 2 + 0 + 3 + 3 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5833446129 + 668274201 = 76377^2 + 25851^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6501720294 and 6501720303.

It is not an unprimeable number, because it can be changed into a prime (6501720331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 732747 + ... + 741566.

Almost surely, 2^6501720330 is an apocalyptic number.

6501720330 is an abundant number, since it is smaller than the sum of its proper divisors (13162679802).

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

6501720330 is a wasteful number, since it uses less digits than its factorization.

6501720330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474340 (or 1474330 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 6501720330 is about 80633.2458108937. The cubic root of 6501720330 is about 1866.4202087808.

Adding to 6501720330 its reverse (330271056), we get a palindrome (6831991386).

The spelling of 6501720330 in words is "six billion, five hundred one million, seven hundred twenty thousand, three hundred thirty".