80840555221 has 2 divisors, whose sum is σ = 80840555222. Its totient is φ = 80840555220.

The previous prime is 80840555167. The next prime is 80840555251. The reversal of 80840555221 is 12255504808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79239435025 + 1601120196 = 281495^2 + 40014^2 .

It is a cyclic number.

It is not a de Polignac number, because 80840555221 - 2¹¹ = 80840553173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80840555251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40420277610 + 40420277611.

It is an arithmetic number, because the mean of its divisors is an integer number (40420277611).

Almost surely, 2^80840555221 is an apocalyptic number.

It is an amenable number.

80840555221 is a deficient number, since it is larger than the sum of its proper divisors (1).

80840555221 is an equidigital number, since it uses as much as digits as its factorization.

80840555221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128000, while the sum is 40.

The spelling of 80840555221 in words is "eighty billion, eight hundred forty million, five hundred fifty-five thousand, two hundred twenty-one".