82171091012 has 6 divisors (see below), whose sum is σ = 143799409278. Its totient is φ = 41085545504.

The previous prime is 82171091003. The next prime is 82171091053. The reversal of 82171091012 is 21019017128.

It can be written as a sum of positive squares in only one way, i.e., 80374518016 + 1796572996 = 283504^2 + 42386^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 82171091012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271386373 + ... + 10271386380.

It is an arithmetic number, because the mean of its divisors is an integer number (23966568213).

Almost surely, 2^82171091012 is an apocalyptic number.

It is an amenable number.

82171091012 is a deficient number, since it is larger than the sum of its proper divisors (61628318266).

82171091012 is a wasteful number, since it uses less digits than its factorization.

82171091012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20542772757 (or 20542772755 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 32.

The spelling of 82171091012 in words is "eighty-two billion, one hundred seventy-one million, ninety-one thousand, twelve".