16663541 has 2 divisors, whose sum is σ = 16663542. Its totient is φ = 16663540.

The previous prime is 16663531. The next prime is 16663583. The reversal of 16663541 is 14536661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11122225 + 5541316 = 3335^2 + 2354^2 .

It is an emirp because it is prime and its reverse (14536661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16663541 - 2¹⁰ = 16662517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16663498 and 16663507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16663501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331770 + 8331771.

It is an arithmetic number, because the mean of its divisors is an integer number (8331771).

Almost surely, 2^16663541 is an apocalyptic number.

It is an amenable number.

16663541 is a deficient number, since it is larger than the sum of its proper divisors (1).

16663541 is an equidigital number, since it uses as much as digits as its factorization.

16663541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 16663541 is about 4082.1000722667. The cubic root of 16663541 is about 255.4205082805.

The spelling of 16663541 in words is "sixteen million, six hundred sixty-three thousand, five hundred forty-one".