80729856913 has 2 divisors, whose sum is σ = 80729856914. Its totient is φ = 80729856912.

The previous prime is 80729856869. The next prime is 80729856931. The reversal of 80729856913 is 31965892708.

Together with next prime (80729856931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80493066369 + 236790544 = 283713^2 + 15388^2 .

It is a cyclic number.

It is not a de Polignac number, because 80729856913 - 2¹³ = 80729848721 is a prime.

It is not a weakly prime, because it can be changed into another prime (80729856983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40364928456 + 40364928457.

It is an arithmetic number, because the mean of its divisors is an integer number (40364928457).

Almost surely, 2^80729856913 is an apocalyptic number.

It is an amenable number.

80729856913 is a deficient number, since it is larger than the sum of its proper divisors (1).

80729856913 is an equidigital number, since it uses as much as digits as its factorization.

80729856913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 80729856913 in words is "eighty billion, seven hundred twenty-nine million, eight hundred fifty-six thousand, nine hundred thirteen".