82171243398 has 16 divisors (see below), whose sum is σ = 164372042736. Its totient is φ = 27385488480.

The previous prime is 82171243397. The next prime is 82171243477. The reversal of 82171243398 is 89334217128.

It is a happy number.

It is a super-2 number, since 2×82171243398² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82171243391) 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 7 ways as a sum of consecutive naturals, for example, 1195273 + ... + 1262148.

It is an arithmetic number, because the mean of its divisors is an integer number (10273252671).

Almost surely, 2^82171243398 is an apocalyptic number.

82171243398 is an abundant number, since it is smaller than the sum of its proper divisors (82200799338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82171243398 is a wasteful number, since it uses less digits than its factorization.

82171243398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2462999.

The product of its digits is 580608, while the sum is 48.

The spelling of 82171243398 in words is "eighty-two billion, one hundred seventy-one million, two hundred forty-three thousand, three hundred ninety-eight".