135404521425 has 24 divisors (see below), whose sum is σ = 248743122080. Its totient is φ = 72215744400.

The previous prime is 135404521409. The next prime is 135404521429. The reversal of 135404521425 is 524125404531.

135404521425 is a `hidden beast` number, since 1 + 35 + 404 + 5 + 214 + 2 + 5 = 666.

It is not a de Polignac number, because 135404521425 - 2⁴ = 135404521409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135404521425.

It is not an unprimeable number, because it can be changed into a prime (135404521429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100298971 + ... + 100300320.

Almost surely, 2^135404521425 is an apocalyptic number.

135404521425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135404521425 is a deficient number, since it is larger than the sum of its proper divisors (113338600655).

135404521425 is a wasteful number, since it uses less digits than its factorization.

135404521425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200599310 (or 200599299 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

Adding to 135404521425 its reverse (524125404531), we get a palindrome (659529925956).

The spelling of 135404521425 in words is "one hundred thirty-five billion, four hundred four million, five hundred twenty-one thousand, four hundred twenty-five".