51204213636517 has 2 divisors, whose sum is σ = 51204213636518. Its totient is φ = 51204213636516.

The previous prime is 51204213636497. The next prime is 51204213636529. The reversal of 51204213636517 is 71563631240215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37032896437156 + 14171317199361 = 6085466^2 + 3764481^2 .

It is a cyclic number.

It is not a de Polignac number, because 51204213636517 - 2³⁹ = 50654457822629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51204213636617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25602106818258 + 25602106818259.

It is an arithmetic number, because the mean of its divisors is an integer number (25602106818259).

Almost surely, 2^{51204213636517} is an apocalyptic number.

It is an amenable number.

51204213636517 is a deficient number, since it is larger than the sum of its proper divisors (1).

51204213636517 is an equidigital number, since it uses as much as digits as its factorization.

51204213636517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 51204213636517 in words is "fifty-one trillion, two hundred four billion, two hundred thirteen million, six hundred thirty-six thousand, five hundred seventeen".