51616326205517 has 2 divisors, whose sum is σ = 51616326205518. Its totient is φ = 51616326205516.

The previous prime is 51616326205397. The next prime is 51616326205531. The reversal of 51616326205517 is 71550262361615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50997608670121 + 618717535396 = 7141261^2 + 786586^2 .

It is a cyclic number.

It is not a de Polignac number, because 51616326205517 - 2¹⁶ = 51616326139981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51616326255517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25808163102758 + 25808163102759.

It is an arithmetic number, because the mean of its divisors is an integer number (25808163102759).

Almost surely, 2^{51616326205517} is an apocalyptic number.

It is an amenable number.

51616326205517 is a deficient number, since it is larger than the sum of its proper divisors (1).

51616326205517 is an equidigital number, since it uses as much as digits as its factorization.

51616326205517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268000, while the sum is 50.

The spelling of 51616326205517 in words is "fifty-one trillion, six hundred sixteen billion, three hundred twenty-six million, two hundred five thousand, five hundred seventeen".