3966646447 has 8 divisors (see below), whose sum is σ = 4272629760. Its totient is φ = 3671789880.

The previous prime is 3966646367. The next prime is 3966646469. The reversal of 3966646447 is 7446466693.

It is a happy number.

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 3966646447 - 2¹⁹ = 3966122159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966646487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2780947 + ... + 2782372.

It is an arithmetic number, because the mean of its divisors is an integer number (534078720).

Almost surely, 2^3966646447 is an apocalyptic number.

3966646447 is a deficient number, since it is larger than the sum of its proper divisors (305983313).

3966646447 is a wasteful number, since it uses less digits than its factorization.

3966646447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5563373.

The product of its digits is 15676416, while the sum is 55.

The square root of 3966646447 is about 62981.3182380299. The cubic root of 3966646447 is about 1582.9766094191.

The spelling of 3966646447 in words is "three billion, nine hundred sixty-six million, six hundred forty-six thousand, four hundred forty-seven".