135243524621523 has 8 divisors (see below), whose sum is σ = 182497286236608. Its totient is φ = 89076056377064.

The previous prime is 135243524621519. The next prime is 135243524621587. The reversal of 135243524621523 is 325126425342531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135243524621523 - 2² = 135243524621519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135243524611523) 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 7 ways as a sum of consecutive naturals, for example, 271573342365 + ... + 271573342862.

It is an arithmetic number, because the mean of its divisors is an integer number (22812160779576).

Almost surely, 2^{135243524621523} is an apocalyptic number.

135243524621523 is a deficient number, since it is larger than the sum of its proper divisors (47253761615085).

135243524621523 is an equidigital number, since it uses as much as digits as its factorization.

135243524621523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543146685313.

The product of its digits is 5184000, while the sum is 48.

The spelling of 135243524621523 in words is "one hundred thirty-five trillion, two hundred forty-three billion, five hundred twenty-four million, six hundred twenty-one thousand, five hundred twenty-three".