6635520013 has 2 divisors, whose sum is σ = 6635520014. Its totient is φ = 6635520012.

The previous prime is 6635519999. The next prime is 6635520029. The reversal of 6635520013 is 3100255366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4369474404 + 2266045609 = 66102^2 + 47603^2 .

It is a cyclic number.

It is not a de Polignac number, because 6635520013 - 2²⁹ = 6098649101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6635520313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3317760006 + 3317760007.

It is an arithmetic number, because the mean of its divisors is an integer number (3317760007).

Almost surely, 2^6635520013 is an apocalyptic number.

It is an amenable number.

6635520013 is a deficient number, since it is larger than the sum of its proper divisors (1).

6635520013 is an equidigital number, since it uses as much as digits as its factorization.

6635520013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 6635520013 is about 81458.7012724853. The cubic root of 6635520013 is about 1879.1364689882.

Adding to 6635520013 its reverse (3100255366), we get a palindrome (9735775379).

It can be divided in two parts, 66355 and 20013, that added together give a palindrome (86368).

The spelling of 6635520013 in words is "six billion, six hundred thirty-five million, five hundred twenty thousand, thirteen".