18105855365 has 16 divisors (see below), whose sum is σ = 23417478000. Its totient is φ = 13359539712.

The previous prime is 18105855311. The next prime is 18105855401. The reversal of 18105855365 is 56355850181.

It is a Cunningham number, because it is equal to 134558²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 2678476516 + 15427378849 = 51754^2 + 124207^2 .

It is a cyclic number.

It is not a de Polignac number, because 18105855365 - 2⁶ = 18105855301 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33440 + ... + 193209.

It is an arithmetic number, because the mean of its divisors is an integer number (1463592375).

Almost surely, 2^18105855365 is an apocalyptic number.

It is an amenable number.

18105855365 is a deficient number, since it is larger than the sum of its proper divisors (5311622635).

18105855365 is a wasteful number, since it uses less digits than its factorization.

18105855365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227896.

The product of its (nonzero) digits is 720000, while the sum is 47.

The spelling of 18105855365 in words is "eighteen billion, one hundred five million, eight hundred fifty-five thousand, three hundred sixty-five".