66656263 has 4 divisors (see below), whose sum is σ = 67316328. Its totient is φ = 65996200.

The previous prime is 66656257. The next prime is 66656267. The reversal of 66656263 is 36265666.

66656263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66656263 - 2⁹ = 66655751 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66656267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329881 + ... + 330082.

It is an arithmetic number, because the mean of its divisors is an integer number (16829082).

Almost surely, 2^66656263 is an apocalyptic number.

66656263 is a deficient number, since it is larger than the sum of its proper divisors (660065).

66656263 is a wasteful number, since it uses less digits than its factorization.

66656263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660064.

The product of its digits is 233280, while the sum is 40.

The square root of 66656263 is about 8164.3286925503. The cubic root of 66656263 is about 405.4590395402.

The spelling of 66656263 in words is "sixty-six million, six hundred fifty-six thousand, two hundred sixty-three".