6520203613 has 16 divisors (see below), whose sum is σ = 8607268224. Its totient is φ = 4781813760.

The previous prime is 6520203611. The next prime is 6520203653. The reversal of 6520203613 is 3163020256.

It is a cyclic number.

It is not a de Polignac number, because 6520203613 - 2¹ = 6520203611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520203611) 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, 2489220 + ... + 2491837.

It is an arithmetic number, because the mean of its divisors is an integer number (537954264).

Almost surely, 2^6520203613 is an apocalyptic number.

It is an amenable number.

6520203613 is a deficient number, since it is larger than the sum of its proper divisors (2087064611).

6520203613 is a wasteful number, since it uses less digits than its factorization.

6520203613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4981092.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 6520203613 is about 80747.7777588956. Note that the first 4 decimals coincide. The cubic root of 6520203613 is about 1868.1871736484.

Adding to 6520203613 its reverse (3163020256), we get a palindrome (9683223869).

The spelling of 6520203613 in words is "six billion, five hundred twenty million, two hundred three thousand, six hundred thirteen".