18166608 has 120 divisors (see below), whose sum is σ = 55449576. Its totient is φ = 5529600.

The previous prime is 18166601. The next prime is 18166609. The reversal of 18166608 is 80666181.

It can be written as a sum of positive squares in 4 ways, for example, as 121104 + 18045504 = 348^2 + 4248^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18166601) 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, 100278 + ... + 100458.

Almost surely, 2^18166608 is an apocalyptic number.

18166608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18166608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27724788).

18166608 is an abundant number, since it is smaller than the sum of its proper divisors (37282968).

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

18166608 is a wasteful number, since it uses less digits than its factorization.

18166608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18166608 is about 4262.2304020313. The cubic root of 18166608 is about 262.8802434914.

The spelling of 18166608 in words is "eighteen million, one hundred sixty-six thousand, six hundred eight".