16664663 has 2 divisors, whose sum is σ = 16664664. Its totient is φ = 16664662.

The previous prime is 16664629. The next prime is 16664671. The reversal of 16664663 is 36646661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16664663 - 2¹⁶ = 16599127 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16664563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332331 + 8332332.

It is an arithmetic number, because the mean of its divisors is an integer number (8332332).

Almost surely, 2^16664663 is an apocalyptic number.

16664663 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664663 is an equidigital number, since it uses as much as digits as its factorization.

16664663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 38.

The square root of 16664663 is about 4082.2374992154. The cubic root of 16664663 is about 255.4262408632.

The spelling of 16664663 in words is "sixteen million, six hundred sixty-four thousand, six hundred sixty-three".