12001664 has 16 divisors (see below), whose sum is σ = 23909820. Its totient is φ = 6000768.

The previous prime is 12001571. The next prime is 12001667. The reversal of 12001664 is 46610021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46754 + ... + 47009.

Almost surely, 2^12001664 is an apocalyptic number.

It is an amenable number.

12001664 is a deficient number, since it is larger than the sum of its proper divisors (11908156).

12001664 is an frugal number, since it uses more digits than its factorization.

12001664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93777 (or 93765 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 12001664 is about 3464.3417845242. The cubic root of 12001664 is about 228.9534302688.

Adding to 12001664 its reverse (46610021), we get a palindrome (58611685).

The spelling of 12001664 in words is "twelve million, one thousand, six hundred sixty-four".