18001668 has 12 divisors (see below), whose sum is σ = 42003920. Its totient is φ = 6000552.

The previous prime is 18001639. The next prime is 18001673. The reversal of 18001668 is 86610081.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750058 + ... + 750081.

Almost surely, 2^18001668 is an apocalyptic number.

It is an amenable number.

18001668 is an abundant number, since it is smaller than the sum of its proper divisors (24002252).

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

18001668 is a wasteful number, since it uses less digits than its factorization.

18001668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500146 (or 1500144 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 18001668 is about 4242.8372582507. The cubic root of 18001668 is about 262.0822343498.

The spelling of 18001668 in words is "eighteen million, one thousand, six hundred sixty-eight".