66564503 has 6 divisors (see below), whose sum is σ = 70710696. Its totient is φ = 62648672.

The previous prime is 66564499. The next prime is 66564521. The reversal of 66564503 is 30546566.

It is not a de Polignac number, because 66564503 - 2² = 66564499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66564583) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 114875 + ... + 115452.

It is an arithmetic number, because the mean of its divisors is an integer number (11785116).

Almost surely, 2^66564503 is an apocalyptic number.

66564503 is a deficient number, since it is larger than the sum of its proper divisors (4146193).

66564503 is a wasteful number, since it uses less digits than its factorization.

66564503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230361 (or 230344 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 66564503 is about 8158.7071892549. The cubic root of 66564503 is about 405.2729004582.

The spelling of 66564503 in words is "sixty-six million, five hundred sixty-four thousand, five hundred three".