18685893808 has 120 divisors (see below), whose sum is σ = 40369134464. Its totient is φ = 8366284800.

The previous prime is 18685893803. The next prime is 18685893907. The reversal of 18685893808 is 80839858681.

It is a super-3 number, since 3×18685893808³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18685893808.

It is not an unprimeable number, because it can be changed into a prime (18685893803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8742916 + ... + 8745052.

Almost surely, 2^18685893808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18685893808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20184567232).

18685893808 is an abundant number, since it is smaller than the sum of its proper divisors (21683240656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18685893808 is a wasteful number, since it uses less digits than its factorization.

18685893808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271 (or 2248 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 64.

The spelling of 18685893808 in words is "eighteen billion, six hundred eighty-five million, eight hundred ninety-three thousand, eight hundred eight".