66325409 has 4 divisors (see below), whose sum is σ = 69816240. Its totient is φ = 62834580.

The previous prime is 66325397. The next prime is 66325411. The reversal of 66325409 is 90452366.

66325409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66325409 - 2²⁴ = 49548193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66325439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1745387 + ... + 1745424.

It is an arithmetic number, because the mean of its divisors is an integer number (17454060).

Almost surely, 2^66325409 is an apocalyptic number.

It is an amenable number.

66325409 is a deficient number, since it is larger than the sum of its proper divisors (3490831).

66325409 is a wasteful number, since it uses less digits than its factorization.

66325409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3490830.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 66325409 is about 8144.0413186575. The cubic root of 66325409 is about 404.7870831262.

The spelling of 66325409 in words is "sixty-six million, three hundred twenty-five thousand, four hundred nine".