66343663 has 4 divisors (see below), whose sum is σ = 66426480. Its totient is φ = 66260848.

The previous prime is 66343637. The next prime is 66343681. The reversal of 66343663 is 36634366.

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 66343663 - 2⁵ = 66343631 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 (66343603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40195 + ... + 41812.

It is an arithmetic number, because the mean of its divisors is an integer number (16606620).

Almost surely, 2^66343663 is an apocalyptic number.

66343663 is a deficient number, since it is larger than the sum of its proper divisors (82817).

66343663 is an equidigital number, since it uses as much as digits as its factorization.

66343663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82816.

The product of its digits is 139968, while the sum is 37.

The square root of 66343663 is about 8145.1619382306. The cubic root of 66343663 is about 404.8242147261.

It can be divided in two parts, 6634 and 3663, that multiplied together give a palindrome (24300342).

The spelling of 66343663 in words is "sixty-six million, three hundred forty-three thousand, six hundred sixty-three".