18011664 has 120 divisors (see below), whose sum is σ = 56058912. Its totient is φ = 5352960.

The previous prime is 18011657. The next prime is 18011671. The reversal of 18011664 is 46611081.

It is an interprime number because it is at equal distance from previous prime (18011657) and next prime (18011671).

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, 131404 + ... + 131540.

Almost surely, 2^18011664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18011664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28029456).

18011664 is an abundant number, since it is smaller than the sum of its proper divisors (38047248).

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

18011664 is a wasteful number, since it uses less digits than its factorization.

18011664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 236 counting only the distinct ones).

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

The square root of 18011664 is about 4244.0150800863. The cubic root of 18011664 is about 262.1307352121.

The spelling of 18011664 in words is "eighteen million, eleven thousand, six hundred sixty-four".