16671617 has 4 divisors (see below), whose sum is σ = 16684356. Its totient is φ = 16658880.

The previous prime is 16671559. The next prime is 16671631. The reversal of 16671617 is 71617661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71617661 = 43 ⋅1665527.

It can be written as a sum of positive squares in 2 ways, for example, as 10916416 + 5755201 = 3304^2 + 2399^2 .

It is a cyclic number.

It is not a de Polignac number, because 16671617 - 2⁶ = 16671553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16671647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4148 + ... + 7109.

It is an arithmetic number, because the mean of its divisors is an integer number (4171089).

Almost surely, 2^16671617 is an apocalyptic number.

It is an amenable number.

16671617 is a deficient number, since it is larger than the sum of its proper divisors (12739).

16671617 is a wasteful number, since it uses less digits than its factorization.

16671617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12738.

The product of its digits is 10584, while the sum is 35.

The square root of 16671617 is about 4083.0891491615. The cubic root of 16671617 is about 255.4617648752.

The spelling of 16671617 in words is "sixteen million, six hundred seventy-one thousand, six hundred seventeen".