108509409855861 has 16 divisors (see below), whose sum is σ = 165396433010688. Its totient is φ = 61987091742000.

The previous prime is 108509409855851. The next prime is 108509409855881. The reversal of 108509409855861 is 168558904905801.

It is not a de Polignac number, because 108509409855861 - 2¹⁰ = 108509409854837 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 15 ways as a sum of consecutive naturals, for example, 761815365 + ... + 761957786.

It is an arithmetic number, because the mean of its divisors is an integer number (10337277063168).

Almost surely, 2^{108509409855861} is an apocalyptic number.

It is an amenable number.

108509409855861 is a deficient number, since it is larger than the sum of its proper divisors (56887023154827).

108509409855861 is a wasteful number, since it uses less digits than its factorization.

108509409855861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523776552.

The product of its (nonzero) digits is 124416000, while the sum is 69.

The spelling of 108509409855861 in words is "one hundred eight trillion, five hundred nine billion, four hundred nine million, eight hundred fifty-five thousand, eight hundred sixty-one".