6520239503 has 4 divisors (see below), whose sum is σ = 6520401000. Its totient is φ = 6520078008.

The previous prime is 6520239497. The next prime is 6520239521. The reversal of 6520239503 is 3059320256.

It is a happy number.

It is a Cunningham number, because it is equal to 80748²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6520239503 - 2⁴ = 6520239487 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 (6520232503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40373 + ... + 121121.

It is an arithmetic number, because the mean of its divisors is an integer number (1630100250).

Almost surely, 2^6520239503 is an apocalyptic number.

6520239503 is a deficient number, since it is larger than the sum of its proper divisors (161497).

6520239503 is an equidigital number, since it uses as much as digits as its factorization.

6520239503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161496.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 6520239503 is about 80747.9999938079. Note that the first 5 decimals coincide. The cubic root of 6520239503 is about 1868.1906014102.

Adding to 6520239503 its reverse (3059320256), we get a palindrome (9579559759).

The spelling of 6520239503 in words is "six billion, five hundred twenty million, two hundred thirty-nine thousand, five hundred three".