66298909 has 4 divisors (see below), whose sum is σ = 66368160. Its totient is φ = 66229660.

The previous prime is 66298907. The next prime is 66298913. The reversal of 66298909 is 90989266.

It is a happy number.

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 66298909 - 2¹ = 66298907 is a prime.

It is a Smith number, since the sum of its digits (49) 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 (66298907) 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, 33169 + ... + 35110.

It is an arithmetic number, because the mean of its divisors is an integer number (16592040).

Almost surely, 2^66298909 is an apocalyptic number.

It is an amenable number.

66298909 is a deficient number, since it is larger than the sum of its proper divisors (69251).

66298909 is an equidigital number, since it uses as much as digits as its factorization.

66298909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69250.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 66298909 is about 8142.4141997322. The cubic root of 66298909 is about 404.7331656970.

The spelling of 66298909 in words is "sixty-six million, two hundred ninety-eight thousand, nine hundred nine".