51544056565081 has 2 divisors, whose sum is σ = 51544056565082. Its totient is φ = 51544056565080.

The previous prime is 51544056564983. The next prime is 51544056565139. The reversal of 51544056565081 is 18056565044515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50352378675481 + 1191677889600 = 7095941^2 + 1091640^2 .

It is a cyclic number.

It is not a de Polignac number, because 51544056565081 - 2¹¹ = 51544056563033 is a prime.

It is a super-2 number, since 2×51544056565081² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51544056560081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25772028282540 + 25772028282541.

It is an arithmetic number, because the mean of its divisors is an integer number (25772028282541).

Almost surely, 2^{51544056565081} is an apocalyptic number.

It is an amenable number.

51544056565081 is a deficient number, since it is larger than the sum of its proper divisors (1).

51544056565081 is an equidigital number, since it uses as much as digits as its factorization.

51544056565081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400000, while the sum is 55.

The spelling of 51544056565081 in words is "fifty-one trillion, five hundred forty-four billion, fifty-six million, five hundred sixty-five thousand, eighty-one".