66684563 has 8 divisors (see below), whose sum is σ = 73150896. Its totient is φ = 60285600.

The previous prime is 66684533. The next prime is 66684581. The reversal of 66684563 is 36548666.

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 66684563 - 2⁸ = 66684307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66684533) 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, 14756 + ... + 18737.

It is an arithmetic number, because the mean of its divisors is an integer number (9143862).

Almost surely, 2^66684563 is an apocalyptic number.

66684563 is a deficient number, since it is larger than the sum of its proper divisors (6466333).

66684563 is a wasteful number, since it uses less digits than its factorization.

66684563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33685.

The product of its digits is 622080, while the sum is 44.

The square root of 66684563 is about 8166.0616578618. The cubic root of 66684563 is about 405.5164128301.

The spelling of 66684563 in words is "sixty-six million, six hundred eighty-four thousand, five hundred sixty-three".