18786985805 has 8 divisors (see below), whose sum is σ = 25765009152. Its totient is φ = 12882504528.

The previous prime is 18786985759. The next prime is 18786985823. The reversal of 18786985805 is 50858968781.

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 18786985805 - 2²⁰ = 18785937229 is a prime.

It is a Duffinian number.

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, 268385477 + ... + 268385546.

It is an arithmetic number, because the mean of its divisors is an integer number (3220626144).

Almost surely, 2^18786985805 is an apocalyptic number.

It is an amenable number.

18786985805 is a deficient number, since it is larger than the sum of its proper divisors (6978023347).

18786985805 is an equidigital number, since it uses as much as digits as its factorization.

18786985805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536771035.

The product of its (nonzero) digits is 38707200, while the sum is 65.

The spelling of 18786985805 in words is "eighteen billion, seven hundred eighty-six million, nine hundred eighty-five thousand, eight hundred five".