51418764168481 has 2 divisors, whose sum is σ = 51418764168482. Its totient is φ = 51418764168480.

The previous prime is 51418764168439. The next prime is 51418764168539. The reversal of 51418764168481 is 18486146781415.

51418764168481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33075668811025 + 18343095357456 = 5751145^2 + 4282884^2 .

It is a cyclic number.

It is not a de Polignac number, because 51418764168481 - 2⁷ = 51418764168353 is a prime.

It is a super-2 number, since 2×51418764168481² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51418764168781) 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, 25709382084240 + 25709382084241.

It is an arithmetic number, because the mean of its divisors is an integer number (25709382084241).

Almost surely, 2^{51418764168481} is an apocalyptic number.

It is an amenable number.

51418764168481 is a deficient number, since it is larger than the sum of its proper divisors (1).

51418764168481 is an equidigital number, since it uses as much as digits as its factorization.

51418764168481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41287680, while the sum is 64.

The spelling of 51418764168481 in words is "fifty-one trillion, four hundred eighteen billion, seven hundred sixty-four million, one hundred sixty-eight thousand, four hundred eighty-one".