66469209 has 8 divisors (see below), whose sum is σ = 88873920. Its totient is φ = 44188656.

The previous prime is 66469157. The next prime is 66469213. The reversal of 66469209 is 90296466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66469209 - 2⁹ = 66468697 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66469289) 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 7 ways as a sum of consecutive naturals, for example, 29782 + ... + 31935.

It is an arithmetic number, because the mean of its divisors is an integer number (11109240).

Almost surely, 2^66469209 is an apocalyptic number.

It is an amenable number.

66469209 is a deficient number, since it is larger than the sum of its proper divisors (22404711).

66469209 is a wasteful number, since it uses less digits than its factorization.

66469209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62079.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 66469209 is about 8152.8650792222. The cubic root of 66469209 is about 405.0794113448.

The spelling of 66469209 in words is "sixty-six million, four hundred sixty-nine thousand, two hundred nine".