135523415404521 has 80 divisors (see below), whose sum is σ = 211796703490944. Its totient is φ = 86283205295616.

The previous prime is 135523415404499. The next prime is 135523415404541. The reversal of 135523415404521 is 125404514325531.

135523415404521 is a `hidden beast` number, since 1 + 3 + 5 + 5 + 2 + 3 + 41 + 540 + 45 + 21 = 666.

It is not a de Polignac number, because 135523415404521 - 2⁷ = 135523415404393 is a prime.

It is a super-2 number, since 2×135523415404521² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135523415404541) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 32939490 + ... + 36824676.

Almost surely, 2^{135523415404521} is an apocalyptic number.

It is an amenable number.

135523415404521 is a deficient number, since it is larger than the sum of its proper divisors (76273288086423).

135523415404521 is a wasteful number, since it uses less digits than its factorization.

135523415404521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885452 (or 3885443 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 45.

The spelling of 135523415404521 in words is "one hundred thirty-five trillion, five hundred twenty-three billion, four hundred fifteen million, four hundred four thousand, five hundred twenty-one".