66403003 has 4 divisors (see below), whose sum is σ = 70309080. Its totient is φ = 62496928.

The previous prime is 66402991. The next prime is 66403009. The reversal of 66403003 is 30030466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66403003 - 2⁹ = 66402491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66403009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1953013 + ... + 1953046.

It is an arithmetic number, because the mean of its divisors is an integer number (17577270).

Almost surely, 2^66403003 is an apocalyptic number.

66403003 is a deficient number, since it is larger than the sum of its proper divisors (3906077).

66403003 is a wasteful number, since it uses less digits than its factorization.

66403003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906076.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 66403003 is about 8148.8037772424. The cubic root of 66403003 is about 404.9448748830.

Adding to 66403003 its reverse (30030466), we get a palindrome (96433469).

The spelling of 66403003 in words is "sixty-six million, four hundred three thousand, three".