108509409855855 has 24 divisors (see below), whose sum is σ = 188170335810288. Its totient is φ = 57844805648256.

The previous prime is 108509409855851. The next prime is 108509409855881. The reversal of 108509409855855 is 558558904905801.

It is a happy number.

108509409855855 is a `hidden beast` number, since 10 + 8 + 5 + 0 + 9 + 4 + 0 + 9 + 8 + 558 + 55 = 666.

It is not a de Polignac number, because 108509409855855 - 2² = 108509409855851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108509409855851) 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, 559893877 + ... + 560087646.

It is an arithmetic number, because the mean of its divisors is an integer number (7840430658762).

Almost surely, 2^{108509409855855} is an apocalyptic number.

108509409855855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

108509409855855 is a deficient number, since it is larger than the sum of its proper divisors (79660925954433).

108509409855855 is a wasteful number, since it uses less digits than its factorization.

108509409855855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119983687 (or 1119983684 counting only the distinct ones).

The product of its (nonzero) digits is 518400000, while the sum is 72.

The spelling of 108509409855855 in words is "one hundred eight trillion, five hundred nine billion, four hundred nine million, eight hundred fifty-five thousand, eight hundred fifty-five".