80814066721 has 2 divisors, whose sum is σ = 80814066722. Its totient is φ = 80814066720.

The previous prime is 80814066713. The next prime is 80814066737. The reversal of 80814066721 is 12766041808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78674079121 + 2139987600 = 280489^2 + 46260^2 .

It is a cyclic number.

It is not a de Polignac number, because 80814066721 - 2³ = 80814066713 is a prime.

It is not a weakly prime, because it can be changed into another prime (80814066121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40407033360 + 40407033361.

It is an arithmetic number, because the mean of its divisors is an integer number (40407033361).

Almost surely, 2^80814066721 is an apocalyptic number.

It is an amenable number.

80814066721 is a deficient number, since it is larger than the sum of its proper divisors (1).

80814066721 is an equidigital number, since it uses as much as digits as its factorization.

80814066721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 80814066721 in words is "eighty billion, eight hundred fourteen million, sixty-six thousand, seven hundred twenty-one".