2018686685 has 4 divisors (see below), whose sum is σ = 2422424028. Its totient is φ = 1614949344.

The previous prime is 2018686679. The next prime is 2018686693. The reversal of 2018686685 is 5866868102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 837870916 + 1180815769 = 28946^2 + 34363^2 .

It is a cyclic number.

It is not a de Polignac number, because 2018686685 - 2⁴ = 2018686669 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 3 ways as a sum of consecutive naturals, for example, 201868664 + ... + 201868673.

It is an arithmetic number, because the mean of its divisors is an integer number (605606007).

Almost surely, 2^2018686685 is an apocalyptic number.

It is an amenable number.

2018686685 is a deficient number, since it is larger than the sum of its proper divisors (403737343).

2018686685 is an equidigital number, since it uses as much as digits as its factorization.

2018686685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403737342.

The product of its (nonzero) digits is 1105920, while the sum is 50.

The square root of 2018686685 is about 44929.7972953362. The cubic root of 2018686685 is about 1263.8328499413.

The spelling of 2018686685 in words is "two billion, eighteen million, six hundred eighty-six thousand, six hundred eighty-five".