135521055999 has 24 divisors (see below), whose sum is σ = 224119003680. Its totient is φ = 77301551808.

The previous prime is 135521055997. The next prime is 135521056003. The reversal of 135521055999 is 999550125531.

135521055999 is a `hidden beast` number, since 1 + 35 + 5 + 2 + 10 + 5 + 599 + 9 = 666.

It is not a de Polignac number, because 135521055999 - 2¹ = 135521055997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135521055997) 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, 1895904 + ... + 1966085.

It is an arithmetic number, because the mean of its divisors is an integer number (9338291820).

Almost surely, 2^135521055999 is an apocalyptic number.

135521055999 is a deficient number, since it is larger than the sum of its proper divisors (88597947681).

135521055999 is a wasteful number, since it uses less digits than its factorization.

135521055999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3862559 (or 3862556 counting only the distinct ones).

The product of its (nonzero) digits is 2733750, while the sum is 54.

The spelling of 135521055999 in words is "one hundred thirty-five billion, five hundred twenty-one million, fifty-five thousand, nine hundred ninety-nine".