66298209 has 4 divisors (see below), whose sum is σ = 88397616. Its totient is φ = 44198804.

The previous prime is 66298207. The next prime is 66298223. The reversal of 66298209 is 90289266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66298209 - 2¹ = 66298207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66298207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11049699 + ... + 11049704.

It is an arithmetic number, because the mean of its divisors is an integer number (22099404).

Almost surely, 2^66298209 is an apocalyptic number.

It is an amenable number.

66298209 is a deficient number, since it is larger than the sum of its proper divisors (22099407).

66298209 is a wasteful number, since it uses less digits than its factorization.

66298209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22099406.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 66298209 is about 8142.3712148243. The cubic root of 66298209 is about 404.7317412682.

The spelling of 66298209 in words is "sixty-six million, two hundred ninety-eight thousand, two hundred nine".