16660403 has 2 divisors, whose sum is σ = 16660404. Its totient is φ = 16660402.

The previous prime is 16660351. The next prime is 16660417. The reversal of 16660403 is 30406661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16660403 - 2¹² = 16656307 is a prime.

It is not a weakly prime, because it can be changed into another prime (16660453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330201 + 8330202.

It is an arithmetic number, because the mean of its divisors is an integer number (8330202).

Almost surely, 2^16660403 is an apocalyptic number.

16660403 is a deficient number, since it is larger than the sum of its proper divisors (1).

16660403 is an equidigital number, since it uses as much as digits as its factorization.

16660403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 16660403 is about 4081.7156931859. The cubic root of 16660403 is about 255.4044740760.

The spelling of 16660403 in words is "sixteen million, six hundred sixty thousand, four hundred three".