163683918 has 12 divisors (see below), whose sum is σ = 354648528. Its totient is φ = 54561300.

The previous prime is 163683913. The next prime is 163683941. The reversal of 163683918 is 819386361.

It is a happy number.

163683918 is a `hidden beast` number, since 1 + 636 + 8 + 3 + 9 + 1 + 8 = 666.

163683918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163683913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4546758 + ... + 4546793.

It is an arithmetic number, because the mean of its divisors is an integer number (29554044).

Almost surely, 2^163683918 is an apocalyptic number.

163683918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

163683918 is an abundant number, since it is smaller than the sum of its proper divisors (190964610).

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

163683918 is a wasteful number, since it uses less digits than its factorization.

163683918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9093559 (or 9093556 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 163683918 is about 12793.9015941190. The cubic root of 163683918 is about 547.0184870098.

The spelling of 163683918 in words is "one hundred sixty-three million, six hundred eighty-three thousand, nine hundred eighteen".