50681728681 has 2 divisors, whose sum is σ = 50681728682. Its totient is φ = 50681728680.

The previous prime is 50681728673. The next prime is 50681728711. The reversal of 50681728681 is 18682718605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30584413456 + 20097315225 = 174884^2 + 141765^2 .

It is a cyclic number.

It is not a de Polignac number, because 50681728681 - 2³ = 50681728673 is a prime.

It is a super-2 number, since 2×50681728681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (50681728081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25340864340 + 25340864341.

It is an arithmetic number, because the mean of its divisors is an integer number (25340864341).

Almost surely, 2^50681728681 is an apocalyptic number.

It is an amenable number.

50681728681 is a deficient number, since it is larger than the sum of its proper divisors (1).

50681728681 is an equidigital number, since it uses as much as digits as its factorization.

50681728681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 52.

The spelling of 50681728681 in words is "fifty billion, six hundred eighty-one million, seven hundred twenty-eight thousand, six hundred eighty-one".