81680071196 has 6 divisors (see below), whose sum is σ = 142940124600. Its totient is φ = 40840035596.

The previous prime is 81680071183. The next prime is 81680071199. The reversal of 81680071196 is 69117008618.

It is a self number, because there is not a number n which added to its sum of digits gives 81680071196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81680071199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210008896 + ... + 10210008903.

It is an arithmetic number, because the mean of its divisors is an integer number (23823354100).

Almost surely, 2^81680071196 is an apocalyptic number.

It is an amenable number.

81680071196 is a deficient number, since it is larger than the sum of its proper divisors (61260053404).

81680071196 is a wasteful number, since it uses less digits than its factorization.

81680071196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20420017803 (or 20420017801 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 47.

The spelling of 81680071196 in words is "eighty-one billion, six hundred eighty million, seventy-one thousand, one hundred ninety-six".