66517003 has 4 divisors (see below), whose sum is σ = 76019440. Its totient is φ = 57014568.

The previous prime is 66516949. The next prime is 66517007. The reversal of 66517003 is 30071566.

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 66517003 - 2¹⁷ = 66385931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66517007) 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, 4751208 + ... + 4751221.

It is an arithmetic number, because the mean of its divisors is an integer number (19004860).

Almost surely, 2^66517003 is an apocalyptic number.

66517003 is a deficient number, since it is larger than the sum of its proper divisors (9502437).

66517003 is an equidigital number, since it uses as much as digits as its factorization.

66517003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9502436.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 66517003 is about 8155.7956693385. The cubic root of 66517003 is about 405.1764774764.

Adding to 66517003 its reverse (30071566), we get a palindrome (96588569).

The spelling of 66517003 in words is "sixty-six million, five hundred seventeen thousand, three".