6520044913 has 2 divisors, whose sum is σ = 6520044914. Its totient is φ = 6520044912.

The previous prime is 6520044911. The next prime is 6520044919. The reversal of 6520044913 is 3194400256.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5108389729 + 1411655184 = 71473^2 + 37572^2 .

It is a cyclic number.

It is not a de Polignac number, because 6520044913 - 2¹ = 6520044911 is a prime.

Together with 6520044911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6520044911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260022456 + 3260022457.

It is an arithmetic number, because the mean of its divisors is an integer number (3260022457).

Almost surely, 2^6520044913 is an apocalyptic number.

It is an amenable number.

6520044913 is a deficient number, since it is larger than the sum of its proper divisors (1).

6520044913 is an equidigital number, since it uses as much as digits as its factorization.

6520044913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 6520044913 is about 80746.7950633336. The cubic root of 6520044913 is about 1868.1720164679.

The spelling of 6520044913 in words is "six billion, five hundred twenty million, forty-four thousand, nine hundred thirteen".