16663243 has 2 divisors, whose sum is σ = 16663244. Its totient is φ = 16663242.

The previous prime is 16663219. The next prime is 16663259. The reversal of 16663243 is 34236661.

It is a strong prime.

It is an emirp because it is prime and its reverse (34236661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16663243 is a prime.

It is not a weakly prime, because it can be changed into another prime (16661243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331621 + 8331622.

It is an arithmetic number, because the mean of its divisors is an integer number (8331622).

Almost surely, 2^16663243 is an apocalyptic number.

16663243 is a deficient number, since it is larger than the sum of its proper divisors (1).

16663243 is an equidigital number, since it uses as much as digits as its factorization.

16663243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 31.

The square root of 16663243 is about 4082.0635712835. The cubic root of 16663243 is about 255.4189856797.

The spelling of 16663243 in words is "sixteen million, six hundred sixty-three thousand, two hundred forty-three".