135515768520 has 128 divisors (see below), whose sum is σ = 443594880000. Its totient is φ = 32845735680.

The previous prime is 135515768491. The next prime is 135515768533. The reversal of 135515768520 is 25867515531.

It is a self number, because there is not a number n which added to its sum of digits gives 135515768520.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11344711 + ... + 11356649.

It is an arithmetic number, because the mean of its divisors is an integer number (3465585000).

Almost surely, 2^135515768520 is an apocalyptic number.

135515768520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135515768520 is an abundant number, since it is smaller than the sum of its proper divisors (308079111480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135515768520 is a wasteful number, since it uses less digits than its factorization.

135515768520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20563 (or 20559 counting only the distinct ones).

The product of its (nonzero) digits is 1260000, while the sum is 48.

The spelling of 135515768520 in words is "one hundred thirty-five billion, five hundred fifteen million, seven hundred sixty-eight thousand, five hundred twenty".