51817208797 has 2 divisors, whose sum is σ = 51817208798. Its totient is φ = 51817208796.

The previous prime is 51817208789. The next prime is 51817208837. The reversal of 51817208797 is 79780271815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51687567801 + 129640996 = 227349^2 + 11386^2 .

It is a cyclic number.

It is not a de Polignac number, because 51817208797 - 2³ = 51817208789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51817208777) 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, 25908604398 + 25908604399.

It is an arithmetic number, because the mean of its divisors is an integer number (25908604399).

Almost surely, 2^51817208797 is an apocalyptic number.

It is an amenable number.

51817208797 is a deficient number, since it is larger than the sum of its proper divisors (1).

51817208797 is an equidigital number, since it uses as much as digits as its factorization.

51817208797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1975680, while the sum is 55.

The spelling of 51817208797 in words is "fifty-one billion, eight hundred seventeen million, two hundred eight thousand, seven hundred ninety-seven".