51787575822109 has 2 divisors, whose sum is σ = 51787575822110. Its totient is φ = 51787575822108.

The previous prime is 51787575822029. The next prime is 51787575822173. The reversal of 51787575822109 is 90122857578715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49293949531225 + 2493626290884 = 7020965^2 + 1579122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51787575822109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51787575822509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25893787911054 + 25893787911055.

It is an arithmetic number, because the mean of its divisors is an integer number (25893787911055).

Almost surely, 2^{51787575822109} is an apocalyptic number.

It is an amenable number.

51787575822109 is a deficient number, since it is larger than the sum of its proper divisors (1).

51787575822109 is an equidigital number, since it uses as much as digits as its factorization.

51787575822109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784000, while the sum is 67.

The spelling of 51787575822109 in words is "fifty-one trillion, seven hundred eighty-seven billion, five hundred seventy-five million, eight hundred twenty-two thousand, one hundred nine".