65555050081 has 2 divisors, whose sum is σ = 65555050082. Its totient is φ = 65555050080.

The previous prime is 65555050069. The next prime is 65555050139. The reversal of 65555050081 is 18005055556.

It is a happy number.

65555050081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63093401856 + 2461648225 = 251184^2 + 49615^2 .

It is a cyclic number.

It is not a de Polignac number, because 65555050081 - 2¹¹ = 65555048033 is a prime.

It is a super-2 number, since 2×65555050081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65555050031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32777525040 + 32777525041.

It is an arithmetic number, because the mean of its divisors is an integer number (32777525041).

Almost surely, 2^65555050081 is an apocalyptic number.

It is an amenable number.

65555050081 is a deficient number, since it is larger than the sum of its proper divisors (1).

65555050081 is an equidigital number, since it uses as much as digits as its factorization.

65555050081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150000, while the sum is 40.

The spelling of 65555050081 in words is "sixty-five billion, five hundred fifty-five million, fifty thousand, eighty-one".