51120207166181 has 2 divisors, whose sum is σ = 51120207166182. Its totient is φ = 51120207166180.

The previous prime is 51120207166123. The next prime is 51120207166219. The reversal of 51120207166181 is 18166170202115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44636308843681 + 6483898322500 = 6681041^2 + 2546350^2 .

It is a cyclic number.

It is not a de Polignac number, because 51120207166181 - 2¹⁴ = 51120207149797 is a prime.

It is a super-2 number, since 2×51120207166181² (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 (51120207126181) 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, 25560103583090 + 25560103583091.

It is an arithmetic number, because the mean of its divisors is an integer number (25560103583091).

Almost surely, 2^{51120207166181} is an apocalyptic number.

It is an amenable number.

51120207166181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51120207166181 is an equidigital number, since it uses as much as digits as its factorization.

51120207166181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 41.

Adding to 51120207166181 its reverse (18166170202115), we get a palindrome (69286377368296).

The spelling of 51120207166181 in words is "fifty-one trillion, one hundred twenty billion, two hundred seven million, one hundred sixty-six thousand, one hundred eighty-one".