16604661 has 8 divisors (see below), whose sum is σ = 22193824. Its totient is φ = 11042640.

The previous prime is 16604657. The next prime is 16604683. The reversal of 16604661 is 16640661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16604661 - 2² = 16604657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16604611) 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, 5311 + ... + 7836.

It is an arithmetic number, because the mean of its divisors is an integer number (2774228).

Almost surely, 2^16604661 is an apocalyptic number.

It is an amenable number.

16604661 is a deficient number, since it is larger than the sum of its proper divisors (5589163).

16604661 is a wasteful number, since it uses less digits than its factorization.

16604661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13571.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 16604661 is about 4074.8817160747. The cubic root of 16604661 is about 255.1193136381.

The spelling of 16604661 in words is "sixteen million, six hundred four thousand, six hundred sixty-one".