82171066 has 4 divisors (see below), whose sum is σ = 123256602. Its totient is φ = 41085532.

The previous prime is 82171057. The next prime is 82171091. The reversal of 82171066 is 66017128.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 57380625 + 24790441 = 7575^2 + 4979^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20542765 + ... + 20542768.

Almost surely, 2^82171066 is an apocalyptic number.

82171066 is a deficient number, since it is larger than the sum of its proper divisors (41085536).

82171066 is a wasteful number, since it uses less digits than its factorization.

82171066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41085535.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 82171066 is about 9064.8257567369. The cubic root of 82171066 is about 434.7500497390.

The spelling of 82171066 in words is "eighty-two million, one hundred seventy-one thousand, sixty-six".