82171400071 has 4 divisors (see below), whose sum is σ = 82173033144. Its totient is φ = 82169767000.

The previous prime is 82171400063. The next prime is 82171400083. The reversal of 82171400071 is 17000417128.

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

It is a cyclic number.

It is not a de Polignac number, because 82171400071 - 2³ = 82171400063 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 (82171400011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738580 + ... + 842521.

It is an arithmetic number, because the mean of its divisors is an integer number (20543258286).

Almost surely, 2^82171400071 is an apocalyptic number.

82171400071 is a deficient number, since it is larger than the sum of its proper divisors (1633073).

82171400071 is a wasteful number, since it uses less digits than its factorization.

82171400071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633072.

The product of its (nonzero) digits is 3136, while the sum is 31.

Adding to 82171400071 its reverse (17000417128), we get a palindrome (99171817199).

The spelling of 82171400071 in words is "eighty-two billion, one hundred seventy-one million, four hundred thousand, seventy-one".