135263599523 has 16 divisors (see below), whose sum is σ = 153438650400. Its totient is φ = 118207434240.

The previous prime is 135263599501. The next prime is 135263599547. The reversal of 135263599523 is 325995362531.

It is a Cunningham number, because it is equal to 367782²-1.

It is a cyclic number.

It is not a de Polignac number, because 135263599523 - 2¹⁰ = 135263598499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135263599223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183893 + ... + 551673.

It is an arithmetic number, because the mean of its divisors is an integer number (9589915650).

Almost surely, 2^135263599523 is an apocalyptic number.

135263599523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

135263599523 is a deficient number, since it is larger than the sum of its proper divisors (18175050877).

135263599523 is a wasteful number, since it uses less digits than its factorization.

135263599523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369302.

The product of its digits is 6561000, while the sum is 53.

The spelling of 135263599523 in words is "one hundred thirty-five billion, two hundred sixty-three million, five hundred ninety-nine thousand, five hundred twenty-three".