51640663041181 has 2 divisors, whose sum is σ = 51640663041182. Its totient is φ = 51640663041180.

The previous prime is 51640663041139. The next prime is 51640663041277. The reversal of 51640663041181 is 18114036604615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46823774984100 + 4816888057081 = 6842790^2 + 2194741^2 .

It is a cyclic number.

It is not a de Polignac number, because 51640663041181 - 2¹⁹ = 51640662516893 is a prime.

It is a super-2 number, since 2×51640663041181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51640663041101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25820331520590 + 25820331520591.

It is an arithmetic number, because the mean of its divisors is an integer number (25820331520591).

Almost surely, 2^{51640663041181} is an apocalyptic number.

It is an amenable number.

51640663041181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51640663041181 is an equidigital number, since it uses as much as digits as its factorization.

51640663041181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 46.

Adding to 51640663041181 its reverse (18114036604615), we get a palindrome (69754699645796).

The spelling of 51640663041181 in words is "fifty-one trillion, six hundred forty billion, six hundred sixty-three million, forty-one thousand, one hundred eighty-one".