51366266257 has 2 divisors, whose sum is σ = 51366266258. Its totient is φ = 51366266256.

The previous prime is 51366266213. The next prime is 51366266267. The reversal of 51366266257 is 75266266315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49319970561 + 2046295696 = 222081^2 + 45236^2 .

It is a cyclic number.

It is not a de Polignac number, because 51366266257 - 2³¹ = 49218782609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51366266257.

It is not a weakly prime, because it can be changed into another prime (51366266267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25683133128 + 25683133129.

It is an arithmetic number, because the mean of its divisors is an integer number (25683133129).

Almost surely, 2^51366266257 is an apocalyptic number.

It is an amenable number.

51366266257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51366266257 is an equidigital number, since it uses as much as digits as its factorization.

51366266257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 49.

The spelling of 51366266257 in words is "fifty-one billion, three hundred sixty-six million, two hundred sixty-six thousand, two hundred fifty-seven".