51254075136809 has 2 divisors, whose sum is σ = 51254075136810. Its totient is φ = 51254075136808.

The previous prime is 51254075136773. The next prime is 51254075136893. The reversal of 51254075136809 is 90863157045215.

51254075136809 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., 51132110051584 + 121965085225 = 7150672^2 + 349235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51254075136809 is a prime.

It is not a weakly prime, because it can be changed into another prime (51254075166809) 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, 25627037568404 + 25627037568405.

It is an arithmetic number, because the mean of its divisors is an integer number (25627037568405).

It is a 1-persistent number, because it is pandigital, but 2⋅51254075136809 = 102508150273618 is not.

Almost surely, 2^{51254075136809} is an apocalyptic number.

It is an amenable number.

51254075136809 is a deficient number, since it is larger than the sum of its proper divisors (1).

51254075136809 is an equidigital number, since it uses as much as digits as its factorization.

51254075136809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072000, while the sum is 56.

The spelling of 51254075136809 in words is "fifty-one trillion, two hundred fifty-four billion, seventy-five million, one hundred thirty-six thousand, eight hundred nine".