136505561544 has 96 divisors (see below), whose sum is σ = 403940628000. Its totient is φ = 41300835840.

The previous prime is 136505561539. The next prime is 136505561573. The reversal of 136505561544 is 445165505631.

136505561544 is a `hidden beast` number, since 1 + 3 + 6 + 50 + 5 + 56 + 1 + 544 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 136505561544.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 375232 + ... + 643280.

It is an arithmetic number, because the mean of its divisors is an integer number (4207714875).

Almost surely, 2^136505561544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 136505561544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201970314000).

136505561544 is an abundant number, since it is smaller than the sum of its proper divisors (267435066456).

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

136505561544 is a wasteful number, since it uses less digits than its factorization.

136505561544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268715 (or 268708 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 45.

The spelling of 136505561544 in words is "one hundred thirty-six billion, five hundred five million, five hundred sixty-one thousand, five hundred forty-four".