51512505730321 has 2 divisors, whose sum is σ = 51512505730322. Its totient is φ = 51512505730320.

The previous prime is 51512505730291. The next prime is 51512505730391. The reversal of 51512505730321 is 12303750521515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51510606513921 + 1899216400 = 7177089^2 + 43580^2 .

It is a cyclic number.

It is not a de Polignac number, because 51512505730321 - 2⁵ = 51512505730289 is a prime.

It is not a weakly prime, because it can be changed into another prime (51512505730391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25756252865160 + 25756252865161.

It is an arithmetic number, because the mean of its divisors is an integer number (25756252865161).

Almost surely, 2^{51512505730321} is an apocalyptic number.

It is an amenable number.

51512505730321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51512505730321 is an equidigital number, since it uses as much as digits as its factorization.

51512505730321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157500, while the sum is 40.

The spelling of 51512505730321 in words is "fifty-one trillion, five hundred twelve billion, five hundred five million, seven hundred thirty thousand, three hundred twenty-one".