3971664809 has 8 divisors (see below), whose sum is σ = 4546243968. Its totient is φ = 3398885280.

The previous prime is 3971664773. The next prime is 3971664911. The reversal of 3971664809 is 9084661793.

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

It is not a de Polignac number, because 3971664809 - 2¹⁶ = 3971599273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3971664209) 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, 445172 + ... + 454005.

It is an arithmetic number, because the mean of its divisors is an integer number (568280496).

Almost surely, 2^3971664809 is an apocalyptic number.

It is an amenable number.

3971664809 is a deficient number, since it is larger than the sum of its proper divisors (574579159).

3971664809 is an equidigital number, since it uses as much as digits as its factorization.

3971664809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899815.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 3971664809 is about 63021.1457290329. The cubic root of 3971664809 is about 1583.6438902951.

The spelling of 3971664809 in words is "three billion, nine hundred seventy-one million, six hundred sixty-four thousand, eight hundred nine".