82171400072 has 8 divisors (see below), whose sum is σ = 154071375150. Its totient is φ = 41085700032.

The previous prime is 82171400063. The next prime is 82171400083. The reversal of 82171400072 is 27000417128.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 59026646116 + 23144753956 = 242954^2 + 152134^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5135712497 + ... + 5135712512.

Almost surely, 2^82171400072 is an apocalyptic number.

It is an amenable number.

82171400072 is a deficient number, since it is larger than the sum of its proper divisors (71899975078).

82171400072 is a wasteful number, since it uses less digits than its factorization.

82171400072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10271425015 (or 10271425011 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The spelling of 82171400072 in words is "eighty-two billion, one hundred seventy-one million, four hundred thousand, seventy-two".