80821105811 has 2 divisors, whose sum is σ = 80821105812. Its totient is φ = 80821105810.

The previous prime is 80821105801. The next prime is 80821105819. The reversal of 80821105811 is 11850112808.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80821105811 is a prime.

It is a super-2 number, since 2×80821105811² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80821105819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40410552905 + 40410552906.

It is an arithmetic number, because the mean of its divisors is an integer number (40410552906).

Almost surely, 2^80821105811 is an apocalyptic number.

80821105811 is a deficient number, since it is larger than the sum of its proper divisors (1).

80821105811 is an equidigital number, since it uses as much as digits as its factorization.

80821105811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5120, while the sum is 35.

The spelling of 80821105811 in words is "eighty billion, eight hundred twenty-one million, one hundred five thousand, eight hundred eleven".