51358765181 has 2 divisors, whose sum is σ = 51358765182. Its totient is φ = 51358765180.

The previous prime is 51358765163. The next prime is 51358765219. The reversal of 51358765181 is 18156785315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28645562500 + 22713202681 = 169250^2 + 150709^2 .

It is a cyclic number.

It is not a de Polignac number, because 51358765181 - 2¹⁸ = 51358503037 is a prime.

It is a super-2 number, since 2×51358765181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51358365181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25679382590 + 25679382591.

It is an arithmetic number, because the mean of its divisors is an integer number (25679382591).

Almost surely, 2^51358765181 is an apocalyptic number.

It is an amenable number.

51358765181 is a deficient number, since it is larger than the sum of its proper divisors (1).

51358765181 is an equidigital number, since it uses as much as digits as its factorization.

51358765181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008000, while the sum is 50.

The spelling of 51358765181 in words is "fifty-one billion, three hundred fifty-eight million, seven hundred sixty-five thousand, one hundred eighty-one".