135605416521 has 8 divisors (see below), whose sum is σ = 181258114464. Its totient is φ = 90178164800.

The previous prime is 135605416483. The next prime is 135605416523. The reversal of 135605416521 is 125614506531.

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 135605416521 - 2¹⁰ = 135605415497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135605416521.

It is not an unprimeable number, because it can be changed into a prime (135605416523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56360151 + ... + 56362556.

It is an arithmetic number, because the mean of its divisors is an integer number (22657264308).

Almost surely, 2^135605416521 is an apocalyptic number.

It is an amenable number.

135605416521 is a deficient number, since it is larger than the sum of its proper divisors (45652697943).

135605416521 is a wasteful number, since it uses less digits than its factorization.

135605416521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112723111.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 135605416521 in words is "one hundred thirty-five billion, six hundred five million, four hundred sixteen thousand, five hundred twenty-one".