135603663451261 has 2 divisors, whose sum is σ = 135603663451262. Its totient is φ = 135603663451260.

The previous prime is 135603663451241. The next prime is 135603663451301. The reversal of 135603663451261 is 162154366306531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93099457225636 + 42504206225625 = 9648806^2 + 6519525^2 .

It is a cyclic number.

It is not a de Polignac number, because 135603663451261 - 2³⁷ = 135466224497789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135603663451199 and 135603663451208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135603663451211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67801831725630 + 67801831725631.

It is an arithmetic number, because the mean of its divisors is an integer number (67801831725631).

Almost surely, 2^{135603663451261} is an apocalyptic number.

It is an amenable number.

135603663451261 is a deficient number, since it is larger than the sum of its proper divisors (1).

135603663451261 is an equidigital number, since it uses as much as digits as its factorization.

135603663451261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6998400, while the sum is 52.

The spelling of 135603663451261 in words is "one hundred thirty-five trillion, six hundred three billion, six hundred sixty-three million, four hundred fifty-one thousand, two hundred sixty-one".