18105786605 has 8 divisors (see below), whose sum is σ = 21728324472. Its totient is φ = 14483708928.

The previous prime is 18105786583. The next prime is 18105786617. The reversal of 18105786605 is 50668750181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3579269929 + 14526516676 = 59827^2 + 120526^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18105786605 - 2¹⁶ = 18105721069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18105786605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21584 + ... + 191513.

It is an arithmetic number, because the mean of its divisors is an integer number (2716040559).

Almost surely, 2^18105786605 is an apocalyptic number.

It is an amenable number.

18105786605 is a deficient number, since it is larger than the sum of its proper divisors (3622537867).

18105786605 is a wasteful number, since it uses less digits than its factorization.

18105786605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230095.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 18105786605 in words is "eighteen billion, one hundred five million, seven hundred eighty-six thousand, six hundred five".