8066171821 has 16 divisors (see below), whose sum is σ = 8792803840. Its totient is φ = 7371336960.

The previous prime is 8066171749. The next prime is 8066171831. The reversal of 8066171821 is 1281716608.

It is a cyclic number.

It is not a de Polignac number, because 8066171821 - 2⁷ = 8066171693 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 (8066171831) 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, 162481 + ... + 206233.

It is an arithmetic number, because the mean of its divisors is an integer number (549550240).

Almost surely, 2^8066171821 is an apocalyptic number.

It is an amenable number.

8066171821 is a deficient number, since it is larger than the sum of its proper divisors (726632019).

8066171821 is a wasteful number, since it uses less digits than its factorization.

8066171821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44116.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 8066171821 is about 89811.8690430168. The cubic root of 8066171821 is about 2005.4991840457.

The spelling of 8066171821 in words is "eight billion, sixty-six million, one hundred seventy-one thousand, eight hundred twenty-one".