66674209 has 8 divisors (see below), whose sum is σ = 77971520. Its totient is φ = 55820016.

The previous prime is 66674207. The next prime is 66674227. The reversal of 66674209 is 90247666.

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

It is not a de Polignac number, because 66674209 - 2¹ = 66674207 is a prime.

It is a super-3 number, since 3×66674209³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66674207) 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, 110454 + ... + 111055.

It is an arithmetic number, because the mean of its divisors is an integer number (9746440).

Almost surely, 2^66674209 is an apocalyptic number.

It is an amenable number.

66674209 is a deficient number, since it is larger than the sum of its proper divisors (11297311).

66674209 is a wasteful number, since it uses less digits than its factorization.

66674209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221559.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 66674209 is about 8165.4276679180. The cubic root of 66674209 is about 405.4954237932.

The spelling of 66674209 in words is "sixty-six million, six hundred seventy-four thousand, two hundred nine".