513165453721 has 2 divisors, whose sum is σ = 513165453722. Its totient is φ = 513165453720.

The previous prime is 513165453683. The next prime is 513165453751. The reversal of 513165453721 is 127354561315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 513142995600 + 22458121 = 716340^2 + 4739^2 .

It is a cyclic number.

It is not a de Polignac number, because 513165453721 - 2¹⁵ = 513165420953 is a prime.

It is not a weakly prime, because it can be changed into another prime (513165453751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256582726860 + 256582726861.

It is an arithmetic number, because the mean of its divisors is an integer number (256582726861).

Almost surely, 2^513165453721 is an apocalyptic number.

It is an amenable number.

513165453721 is a deficient number, since it is larger than the sum of its proper divisors (1).

513165453721 is an equidigital number, since it uses as much as digits as its factorization.

513165453721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 43.

The spelling of 513165453721 in words is "five hundred thirteen billion, one hundred sixty-five million, four hundred fifty-three thousand, seven hundred twenty-one".