81927681179 has 2 divisors, whose sum is σ = 81927681180. Its totient is φ = 81927681178.

The previous prime is 81927681167. The next prime is 81927681221. The reversal of 81927681179 is 97118672918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81927681179 - 2¹⁶ = 81927615643 is a prime.

It is not a weakly prime, because it can be changed into another prime (81929681179) 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 as a sum of consecutive naturals, namely, 40963840589 + 40963840590.

It is an arithmetic number, because the mean of its divisors is an integer number (40963840590).

Almost surely, 2^81927681179 is an apocalyptic number.

81927681179 is a deficient number, since it is larger than the sum of its proper divisors (1).

81927681179 is an equidigital number, since it uses as much as digits as its factorization.

81927681179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 59.

The spelling of 81927681179 in words is "eighty-one billion, nine hundred twenty-seven million, six hundred eighty-one thousand, one hundred seventy-nine".