66650003 has 8 divisors (see below), whose sum is σ = 77420640. Its totient is φ = 56191680.

The previous prime is 66649993. The next prime is 66650027. The reversal of 66650003 is 30005666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66650003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66659003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77618 + ... + 78471.

It is an arithmetic number, because the mean of its divisors is an integer number (9677580).

Almost surely, 2^66650003 is an apocalyptic number.

66650003 is a deficient number, since it is larger than the sum of its proper divisors (10770637).

66650003 is a wasteful number, since it uses less digits than its factorization.

66650003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156157.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 66650003 is about 8163.9453084890. The cubic root of 66650003 is about 405.4463462941.

Adding to 66650003 its reverse (30005666), we get a palindrome (96655669).

The spelling of 66650003 in words is "sixty-six million, six hundred fifty thousand, three".