16601 has 4 divisors (see below), whose sum is σ = 17892. Its totient is φ = 15312.

The previous prime is 16573. The next prime is 16603. The reversal of 16601 is 10661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10661 = 7 ⋅1523.

It can be written as a sum of positive squares in 2 ways, for example, as 6400 + 10201 = 80^2 + 101^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (16603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626 + ... + 651.

It is an arithmetic number, because the mean of its divisors is an integer number (4473).

2¹⁶⁶⁰¹ is an apocalyptic number.

It is an amenable number.

16601 is a deficient number, since it is larger than the sum of its proper divisors (1291).

16601 is a wasteful number, since it uses less digits than its factorization.

16601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 16601 is about 128.8448679614. The cubic root of 16601 is about 25.5100562669.

It can be divided in two parts, 1660 and 1, that added together give a palindrome (1661).

The spelling of 16601 in words is "sixteen thousand, six hundred one".