66505003 has 8 divisors (see below), whose sum is σ = 70576272. Its totient is φ = 62451456.

The previous prime is 66505001. The next prime is 66505007. The reversal of 66505003 is 30050566.

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

It is a cyclic number.

It is not a de Polignac number, because 66505003 - 2¹ = 66505001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66505001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3751 + ... + 12127.

It is an arithmetic number, because the mean of its divisors is an integer number (8822034).

Almost surely, 2^66505003 is an apocalyptic number.

66505003 is a deficient number, since it is larger than the sum of its proper divisors (4071269).

66505003 is a wasteful number, since it uses less digits than its factorization.

66505003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8861.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 66505003 is about 8155.0599629923. The cubic root of 66505003 is about 405.1521107234.

Adding to 66505003 its reverse (30050566), we get a palindrome (96555569).

The spelling of 66505003 in words is "sixty-six million, five hundred five thousand, three".