16605541 has 4 divisors (see below), whose sum is σ = 16670412. Its totient is φ = 16540672.

The previous prime is 16605521. The next prime is 16605559. The reversal of 16605541 is 14550661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11874916 + 4730625 = 3446^2 + 2175^2 .

It is a cyclic number.

It is not a de Polignac number, because 16605541 - 2⁵ = 16605509 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 (16605521) 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, 32050 + ... + 32563.

It is an arithmetic number, because the mean of its divisors is an integer number (4167603).

Almost surely, 2^16605541 is an apocalyptic number.

It is an amenable number.

16605541 is a deficient number, since it is larger than the sum of its proper divisors (64871).

16605541 is an equidigital number, since it uses as much as digits as its factorization.

16605541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64870.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 16605541 is about 4074.9896932385. The cubic root of 16605541 is about 255.1238204255.

The spelling of 16605541 in words is "sixteen million, six hundred five thousand, five hundred forty-one".