16664541 has 8 divisors (see below), whose sum is σ = 22820064. Its totient is φ = 10809360.

The previous prime is 16664519. The next prime is 16664551. The reversal of 16664541 is 14546661.

It is a happy number.

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

It is not a de Polignac number, because 16664541 - 2⁶ = 16664477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16664551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74955 + ... + 75176.

It is an arithmetic number, because the mean of its divisors is an integer number (2852508).

Almost surely, 2^16664541 is an apocalyptic number.

It is an amenable number.

16664541 is a deficient number, since it is larger than the sum of its proper divisors (6155523).

16664541 is a wasteful number, since it uses less digits than its factorization.

16664541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150171.

The product of its digits is 17280, while the sum is 33.

The square root of 16664541 is about 4082.2225564023. Note that the first 3 decimals coincide. The cubic root of 16664541 is about 255.4256175467.

It can be divided in two parts, 16664 and 541, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 16664541 in words is "sixteen million, six hundred sixty-four thousand, five hundred forty-one".