51350478689 has 2 divisors, whose sum is σ = 51350478690. Its totient is φ = 51350478688.

The previous prime is 51350478679. The next prime is 51350478691. The reversal of 51350478689 is 98687405315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41920515025 + 9429963664 = 204745^2 + 97108^2 .

It is a cyclic number.

It is not a de Polignac number, because 51350478689 - 2²⁰ = 51349430113 is a prime.

Together with 51350478691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51350478629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25675239344 + 25675239345.

It is an arithmetic number, because the mean of its divisors is an integer number (25675239345).

Almost surely, 2^51350478689 is an apocalyptic number.

It is an amenable number.

51350478689 is a deficient number, since it is larger than the sum of its proper divisors (1).

51350478689 is an equidigital number, since it uses as much as digits as its factorization.

51350478689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 51350478689 in words is "fifty-one billion, three hundred fifty million, four hundred seventy-eight thousand, six hundred eighty-nine".