51500535517 has 2 divisors, whose sum is σ = 51500535518. Its totient is φ = 51500535516.

The previous prime is 51500535509. The next prime is 51500535589. The reversal of 51500535517 is 71553500515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42078727161 + 9421808356 = 205131^2 + 97066^2 .

It is a cyclic number.

It is not a de Polignac number, because 51500535517 - 2³ = 51500535509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51500535017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25750267758 + 25750267759.

It is an arithmetic number, because the mean of its divisors is an integer number (25750267759).

Almost surely, 2^51500535517 is an apocalyptic number.

It is an amenable number.

51500535517 is a deficient number, since it is larger than the sum of its proper divisors (1).

51500535517 is an equidigital number, since it uses as much as digits as its factorization.

51500535517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65625, while the sum is 37.

The spelling of 51500535517 in words is "fifty-one billion, five hundred million, five hundred thirty-five thousand, five hundred seventeen".