16663091 has 2 divisors, whose sum is σ = 16663092. Its totient is φ = 16663090.

The previous prime is 16663037. The next prime is 16663099. The reversal of 16663091 is 19036661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16663091 - 2²² = 12468787 is a prime.

It is not a weakly prime, because it can be changed into another prime (16663099) 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 as a sum of consecutive naturals, namely, 8331545 + 8331546.

It is an arithmetic number, because the mean of its divisors is an integer number (8331546).

Almost surely, 2^16663091 is an apocalyptic number.

16663091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16663091 is an equidigital number, since it uses as much as digits as its factorization.

16663091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 16663091 is about 4082.0449532067. The cubic root of 16663091 is about 255.4182090441.

The spelling of 16663091 in words is "sixteen million, six hundred sixty-three thousand, ninety-one".