16604001 has 8 divisors (see below), whose sum is σ = 24598560. Its totient is φ = 11069316.

The previous prime is 16603997. The next prime is 16604023. The reversal of 16604001 is 10040661.

16604001 is a `hidden beast` number, since 1 + 660 + 4 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 16604001 - 2² = 16603997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16604051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307455 + ... + 307508.

It is an arithmetic number, because the mean of its divisors is an integer number (3074820).

Almost surely, 2^16604001 is an apocalyptic number.

It is an amenable number.

16604001 is a deficient number, since it is larger than the sum of its proper divisors (7994559).

16604001 is an equidigital number, since it uses as much as digits as its factorization.

16604001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614972 (or 614966 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 16604001 is about 4074.8007313242. The cubic root of 16604001 is about 255.1159334431.

Adding to 16604001 its reverse (10040661), we get a palindrome (26644662).

The spelling of 16604001 in words is "sixteen million, six hundred four thousand, one".