66403 has 2 divisors, whose sum is σ = 66404. Its totient is φ = 66402.

The previous prime is 66383. The next prime is 66413. The reversal of 66403 is 30466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66403 - 2¹³ = 58211 is a prime.

It is not a weakly prime, because it can be changed into another prime (66413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33201 + 33202.

It is an arithmetic number, because the mean of its divisors is an integer number (33202).

2⁶⁶⁴⁰³ is an apocalyptic number.

66403 is a deficient number, since it is larger than the sum of its proper divisors (1).

66403 is an equidigital number, since it uses as much as digits as its factorization.

66403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 66403 is about 257.6877955977. The cubic root of 66403 is about 40.4944868785.

Adding to 66403 its reverse (30466), we get a palindrome (96869).

Subtracting from 66403 its reverse (30466), we obtain a cube (35937 = 33³).

The spelling of 66403 in words is "sixty-six thousand, four hundred three".