135669013681 has 2 divisors, whose sum is σ = 135669013682. Its totient is φ = 135669013680.

The previous prime is 135669013573. The next prime is 135669013691. The reversal of 135669013681 is 186310966531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67943635600 + 67725378081 = 260660^2 + 260241^2 .

It is an emirp because it is prime and its reverse (186310966531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135669013681 - 2¹¹ = 135669011633 is a prime.

It is a super-2 number, since 2×135669013681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135669013691) 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, 67834506840 + 67834506841.

It is an arithmetic number, because the mean of its divisors is an integer number (67834506841).

Almost surely, 2^135669013681 is an apocalyptic number.

It is an amenable number.

135669013681 is a deficient number, since it is larger than the sum of its proper divisors (1).

135669013681 is an equidigital number, since it uses as much as digits as its factorization.

135669013681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 135669013681 in words is "one hundred thirty-five billion, six hundred sixty-nine million, thirteen thousand, six hundred eighty-one".