80705867771 has 2 divisors, whose sum is σ = 80705867772. Its totient is φ = 80705867770.

The previous prime is 80705867707. The next prime is 80705867839. The reversal of 80705867771 is 17776850708.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80705867771 - 2⁶ = 80705867707 is a prime.

It is not a weakly prime, because it can be changed into another prime (80705867701) 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, 40352933885 + 40352933886.

It is an arithmetic number, because the mean of its divisors is an integer number (40352933886).

Almost surely, 2^80705867771 is an apocalyptic number.

80705867771 is a deficient number, since it is larger than the sum of its proper divisors (1).

80705867771 is an equidigital number, since it uses as much as digits as its factorization.

80705867771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4609920, while the sum is 56.

The spelling of 80705867771 in words is "eighty billion, seven hundred five million, eight hundred sixty-seven thousand, seven hundred seventy-one".