16866541 has 2 divisors, whose sum is σ = 16866542. Its totient is φ = 16866540.

The previous prime is 16866527. The next prime is 16866557. The reversal of 16866541 is 14566861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 2653641 = 3770^2 + 1629^2 .

It is a cyclic number.

It is not a de Polignac number, because 16866541 - 2⁹ = 16866029 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16866541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16866571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8433270 + 8433271.

It is an arithmetic number, because the mean of its divisors is an integer number (8433271).

Almost surely, 2^16866541 is an apocalyptic number.

It is an amenable number.

16866541 is a deficient number, since it is larger than the sum of its proper divisors (1).

16866541 is an equidigital number, since it uses as much as digits as its factorization.

16866541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 16866541 is about 4106.8894555369. The cubic root of 16866541 is about 256.4535265078.

The spelling of 16866541 in words is "sixteen million, eight hundred sixty-six thousand, five hundred forty-one".