80771681009 has 2 divisors, whose sum is σ = 80771681010. Its totient is φ = 80771681008.

The previous prime is 80771680963. The next prime is 80771681047. The reversal of 80771681009 is 90018617708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79723216609 + 1048464400 = 282353^2 + 32380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80771681009 is a prime.

It is not a weakly prime, because it can be changed into another prime (80771684009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40385840504 + 40385840505.

It is an arithmetic number, because the mean of its divisors is an integer number (40385840505).

Almost surely, 2^80771681009 is an apocalyptic number.

It is an amenable number.

80771681009 is a deficient number, since it is larger than the sum of its proper divisors (1).

80771681009 is an equidigital number, since it uses as much as digits as its factorization.

80771681009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 47.

The spelling of 80771681009 in words is "eighty billion, seven hundred seventy-one million, six hundred eighty-one thousand, nine".