513525615613 has 2 divisors, whose sum is σ = 513525615614. Its totient is φ = 513525615612.

The previous prime is 513525615599. The next prime is 513525615661. The reversal of 513525615613 is 316516525315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 485471710564 + 28053905049 = 696758^2 + 167493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513525615613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 513525615613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513525615013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256762807806 + 256762807807.

It is an arithmetic number, because the mean of its divisors is an integer number (256762807807).

Almost surely, 2^513525615613 is an apocalyptic number.

It is an amenable number.

513525615613 is a deficient number, since it is larger than the sum of its proper divisors (1).

513525615613 is an equidigital number, since it uses as much as digits as its factorization.

513525615613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 405000, while the sum is 43.

The spelling of 513525615613 in words is "five hundred thirteen billion, five hundred twenty-five million, six hundred fifteen thousand, six hundred thirteen".