806171664443 has 16 divisors (see below), whose sum is σ = 830630475360. Its totient is φ = 781954387200.

The previous prime is 806171664407. The next prime is 806171664461. The reversal of 806171664443 is 344466171608.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 806171664443 - 2²⁴ = 806154887227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 806171664391 and 806171664400.

It is not an unprimeable number, because it can be changed into a prime (806171661443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4844033 + ... + 5007693.

It is an arithmetic number, because the mean of its divisors is an integer number (51914404710).

Almost surely, 2^806171664443 is an apocalyptic number.

806171664443 is a deficient number, since it is larger than the sum of its proper divisors (24458810917).

806171664443 is a wasteful number, since it uses less digits than its factorization.

806171664443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164398.

The product of its (nonzero) digits is 2322432, while the sum is 50.

The spelling of 806171664443 in words is "eight hundred six billion, one hundred seventy-one million, six hundred sixty-four thousand, four hundred forty-three".