666239590009 has 4 divisors (see below), whose sum is σ = 761416674304. Its totient is φ = 571062505716.

The previous prime is 666239589997. The next prime is 666239590013. The reversal of 666239590009 is 900095932666.

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 666239590009 - 2¹⁵ = 666239557241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666239590309) 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, 47588542137 + ... + 47588542150.

It is an arithmetic number, because the mean of its divisors is an integer number (190354168576).

Almost surely, 2^666239590009 is an apocalyptic number.

It is an amenable number.

666239590009 is a deficient number, since it is larger than the sum of its proper divisors (95177084295).

666239590009 is an equidigital number, since it uses as much as digits as its factorization.

666239590009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95177084294.

The product of its (nonzero) digits is 4723920, while the sum is 55.

The spelling of 666239590009 in words is "six hundred sixty-six billion, two hundred thirty-nine million, five hundred ninety thousand, nine".