66404505 has 8 divisors (see below), whose sum is σ = 106247232. Its totient is φ = 35415728.

The previous prime is 66404501. The next prime is 66404549. The reversal of 66404505 is 50540466.

66404505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 66404505 - 2² = 66404501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66404501) 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 7 ways as a sum of consecutive naturals, for example, 2213469 + ... + 2213498.

It is an arithmetic number, because the mean of its divisors is an integer number (13280904).

Almost surely, 2^66404505 is an apocalyptic number.

It is an amenable number.

66404505 is a deficient number, since it is larger than the sum of its proper divisors (39842727).

66404505 is a wasteful number, since it uses less digits than its factorization.

66404505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426975.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 66404505 is about 8148.8959374875. The cubic root of 66404505 is about 404.9479280713.

The spelling of 66404505 in words is "sixty-six million, four hundred four thousand, five hundred five".