108186403781 has 4 divisors (see below), whose sum is σ = 108355181964. Its totient is φ = 108017625600.

The previous prime is 108186403747. The next prime is 108186403817. The reversal of 108186403781 is 187304681801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187304681801 = 937 ⋅199898273.

It can be written as a sum of positive squares in 2 ways, for example, as 66804673156 + 41381730625 = 258466^2 + 203425^2 .

It is a cyclic number.

It is not a de Polignac number, because 108186403781 - 2²⁶ = 108119294917 is a prime.

It is a super-2 number, since 2×108186403781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108186403981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84388130 + ... + 84389411.

It is an arithmetic number, because the mean of its divisors is an integer number (27088795491).

Almost surely, 2^108186403781 is an apocalyptic number.

It is an amenable number.

108186403781 is a deficient number, since it is larger than the sum of its proper divisors (168778183).

108186403781 is an equidigital number, since it uses as much as digits as its factorization.

108186403781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168778182.

The product of its (nonzero) digits is 258048, while the sum is 47.

The spelling of 108186403781 in words is "one hundred eight billion, one hundred eighty-six million, four hundred three thousand, seven hundred eighty-one".