51056556105109 has 2 divisors, whose sum is σ = 51056556105110. Its totient is φ = 51056556105108.

The previous prime is 51056556105001. The next prime is 51056556105173. The reversal of 51056556105109 is 90150165565015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49746854391025 + 1309701714084 = 7053145^2 + 1144422^2 .

It is a cyclic number.

It is not a de Polignac number, because 51056556105109 - 2³⁹ = 50506800291221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51056556105509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25528278052554 + 25528278052555.

It is an arithmetic number, because the mean of its divisors is an integer number (25528278052555).

Almost surely, 2^{51056556105109} is an apocalyptic number.

It is an amenable number.

51056556105109 is a deficient number, since it is larger than the sum of its proper divisors (1).

51056556105109 is an equidigital number, since it uses as much as digits as its factorization.

51056556105109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1012500, while the sum is 49.

The spelling of 51056556105109 in words is "fifty-one trillion, fifty-six billion, five hundred fifty-six million, one hundred five thousand, one hundred nine".