18135666 has 48 divisors (see below), whose sum is σ = 40622400. Its totient is φ = 5844960.

The previous prime is 18135659. The next prime is 18135679. The reversal of 18135666 is 66653181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18135666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91035 + ... + 91233.

It is an arithmetic number, because the mean of its divisors is an integer number (846300).

Almost surely, 2^18135666 is an apocalyptic number.

18135666 is an abundant number, since it is smaller than the sum of its proper divisors (22486734).

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

18135666 is a wasteful number, since it uses less digits than its factorization.

18135666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 348 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 18135666 is about 4258.5990654205. The cubic root of 18135666 is about 262.7309097444.

It can be divided in two parts, 181 and 35666, that multiplied together give a palindrome (6455546).

The spelling of 18135666 in words is "eighteen million, one hundred thirty-five thousand, six hundred sixty-six".