18661104 has 300 divisors, whose sum is σ = 71839152. Its totient is φ = 4561920.

The previous prime is 18661099. The next prime is 18661129. The reversal of 18661104 is 40116681.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1097704 + ... + 1097720.

Almost surely, 2^18661104 is an apocalyptic number.

18661104 is a gapful number since it is divisible by the number (14) 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 18661104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35919576).

18661104 is an abundant number, since it is smaller than the sum of its proper divisors (53178048).

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

18661104 is a wasteful number, since it uses less digits than its factorization.

18661104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18661104 is about 4319.8499973957. The cubic root of 18661104 is about 265.2441277075.

Adding to 18661104 its reverse (40116681), we get a palindrome (58777785).

The spelling of 18661104 in words is "eighteen million, six hundred sixty-one thousand, one hundred four".