81680017681706 has 16 divisors (see below), whose sum is σ = 124350702582240. Its totient is φ = 40229803281360.

The previous prime is 81680017681681. The next prime is 81680017681711. The reversal of 81680017681706 is 60718671008618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3387776 + ... + 13222596.

It is an arithmetic number, because the mean of its divisors is an integer number (7771918911390).

Almost surely, 2^{81680017681706} is an apocalyptic number.

81680017681706 is a deficient number, since it is larger than the sum of its proper divisors (42670684900534).

81680017681706 is a wasteful number, since it uses less digits than its factorization.

81680017681706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9896869.

The product of its (nonzero) digits is 5419008, while the sum is 59.

The spelling of 81680017681706 in words is "eighty-one trillion, six hundred eighty billion, seventeen million, six hundred eighty-one thousand, seven hundred six".