6613525613 has 2 divisors, whose sum is σ = 6613525614. Its totient is φ = 6613525612.

The previous prime is 6613525609. The next prime is 6613525621. The reversal of 6613525613 is 3165253166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6295152964 + 318372649 = 79342^2 + 17843^2 .

It is a cyclic number.

It is not a de Polignac number, because 6613525613 - 2² = 6613525609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6613525013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3306762806 + 3306762807.

It is an arithmetic number, because the mean of its divisors is an integer number (3306762807).

Almost surely, 2^6613525613 is an apocalyptic number.

It is an amenable number.

6613525613 is a deficient number, since it is larger than the sum of its proper divisors (1).

6613525613 is an equidigital number, since it uses as much as digits as its factorization.

6613525613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 38.

The square root of 6613525613 is about 81323.5858346150. The cubic root of 6613525613 is about 1877.0579466995.

Adding to 6613525613 its reverse (3165253166), we get a palindrome (9778778779).

The spelling of 6613525613 in words is "six billion, six hundred thirteen million, five hundred twenty-five thousand, six hundred thirteen".