513225442661 has 2 divisors, whose sum is σ = 513225442662. Its totient is φ = 513225442660.

The previous prime is 513225442649. The next prime is 513225442699. The reversal of 513225442661 is 166244522315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286369468225 + 226855974436 = 535135^2 + 476294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513225442661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513225442621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256612721330 + 256612721331.

It is an arithmetic number, because the mean of its divisors is an integer number (256612721331).

Almost surely, 2^513225442661 is an apocalyptic number.

It is an amenable number.

513225442661 is a deficient number, since it is larger than the sum of its proper divisors (1).

513225442661 is an equidigital number, since it uses as much as digits as its factorization.

513225442661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 41.

Adding to 513225442661 its reverse (166244522315), we get a palindrome (679469964976).

The spelling of 513225442661 in words is "five hundred thirteen billion, two hundred twenty-five million, four hundred forty-two thousand, six hundred sixty-one".