135720138650669 has 2 divisors, whose sum is σ = 135720138650670. Its totient is φ = 135720138650668.

The previous prime is 135720138650659. The next prime is 135720138650693. The reversal of 135720138650669 is 966056831027531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120934844773444 + 14785293877225 = 10997038^2 + 3845165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135720138650669 is a prime.

It is a super-2 number, since 2×135720138650669² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135720138650659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67860069325334 + 67860069325335.

It is an arithmetic number, because the mean of its divisors is an integer number (67860069325335).

Almost surely, 2^{135720138650669} is an apocalyptic number.

It is an amenable number.

135720138650669 is a deficient number, since it is larger than the sum of its proper divisors (1).

135720138650669 is an equidigital number, since it uses as much as digits as its factorization.

135720138650669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48988800, while the sum is 62.

The spelling of 135720138650669 in words is "one hundred thirty-five trillion, seven hundred twenty billion, one hundred thirty-eight million, six hundred fifty thousand, six hundred sixty-nine".