66001003 has 4 divisors (see below), whose sum is σ = 69474760. Its totient is φ = 62527248.

The previous prime is 66000997. The next prime is 66001027. The reversal of 66001003 is 30010066.

It is a happy number.

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 66001003 - 2⁵ = 66000971 is a prime.

It is a super-2 number, since 2×66001003² = 8712264794012018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66001063) 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, 1736850 + ... + 1736887.

It is an arithmetic number, because the mean of its divisors is an integer number (17368690).

Almost surely, 2^66001003 is an apocalyptic number.

66001003 is a deficient number, since it is larger than the sum of its proper divisors (3473757).

66001003 is a wasteful number, since it uses less digits than its factorization.

66001003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473756.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 66001003 is about 8124.1001347842. The cubic root of 66001003 is about 404.1260492053.

Adding to 66001003 its reverse (30010066), we get a palindrome (96011069).

The spelling of 66001003 in words is "sixty-six million, one thousand, three".