66404305 has 8 divisors (see below), whose sum is σ = 86929344. Its totient is φ = 48294000.

The previous prime is 66404281. The next prime is 66404321. The reversal of 66404305 is 50340466.

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

It is a de Polignac number, because none of the positive numbers 2^k-66404305 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603621 + ... + 603730.

It is an arithmetic number, because the mean of its divisors is an integer number (10866168).

Almost surely, 2^66404305 is an apocalyptic number.

It is an amenable number.

66404305 is a deficient number, since it is larger than the sum of its proper divisors (20525039).

66404305 is a wasteful number, since it uses less digits than its factorization.

66404305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207367.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 66404305 is about 8148.8836658772. The cubic root of 66404305 is about 404.9475215243.

The spelling of 66404305 in words is "sixty-six million, four hundred four thousand, three hundred five".