135681240217523 has 16 divisors (see below), whose sum is σ = 182173413440256. Its totient is φ = 97592900055840.

The previous prime is 135681240217489. The next prime is 135681240217541. The reversal of 135681240217523 is 325712042186531.

It is not a de Polignac number, because 135681240217523 - 2¹⁰ = 135681240216499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135681240217583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67772846261 + ... + 67772848262.

It is an arithmetic number, because the mean of its divisors is an integer number (11385838340016).

Almost surely, 2^{135681240217523} is an apocalyptic number.

135681240217523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

135681240217523 is a deficient number, since it is larger than the sum of its proper divisors (46492173222733).

135681240217523 is a wasteful number, since it uses less digits than its factorization.

135681240217523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135545694554.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 135681240217523 in words is "one hundred thirty-five trillion, six hundred eighty-one billion, two hundred forty million, two hundred seventeen thousand, five hundred twenty-three".