445766221656181 has 2 divisors, whose sum is σ = 445766221656182. Its totient is φ = 445766221656180.

The previous prime is 445766221656127. The next prime is 445766221656187. The reversal of 445766221656181 is 181656122667544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 443819753020900 + 1946468635281 = 21067030^2 + 1395159^2 .

It is a cyclic number.

It is not a de Polignac number, because 445766221656181 - 2¹⁹ = 445766221131893 is a prime.

It is a super-2 number, since 2×445766221656181² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445766221656187) 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, 222883110828090 + 222883110828091.

It is an arithmetic number, because the mean of its divisors is an integer number (222883110828091).

Almost surely, 2^{445766221656181} is an apocalyptic number.

It is an amenable number.

445766221656181 is a deficient number, since it is larger than the sum of its proper divisors (1).

445766221656181 is an equidigital number, since it uses as much as digits as its factorization.

445766221656181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116121600, while the sum is 64.

The spelling of 445766221656181 in words is "four hundred forty-five trillion, seven hundred sixty-six billion, two hundred twenty-one million, six hundred fifty-six thousand, one hundred eighty-one".