135664656481 has 2 divisors, whose sum is σ = 135664656482. Its totient is φ = 135664656480.

The previous prime is 135664656431. The next prime is 135664656503. The reversal of 135664656481 is 184656466531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135656675856 + 7980625 = 368316^2 + 2825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135664656481 is a prime.

It is a super-2 number, since 2×135664656481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135664656431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67832328240 + 67832328241.

It is an arithmetic number, because the mean of its divisors is an integer number (67832328241).

Almost surely, 2^135664656481 is an apocalyptic number.

It is an amenable number.

135664656481 is a deficient number, since it is larger than the sum of its proper divisors (1).

135664656481 is an equidigital number, since it uses as much as digits as its factorization.

135664656481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12441600, while the sum is 55.

The spelling of 135664656481 in words is "one hundred thirty-five billion, six hundred sixty-four million, six hundred fifty-six thousand, four hundred eighty-one".