221675565409 has 2 divisors, whose sum is σ = 221675565410. Its totient is φ = 221675565408.

The previous prime is 221675565373. The next prime is 221675565427. The reversal of 221675565409 is 904565576122.

It is a happy number.

221675565409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186130119184 + 35545446225 = 431428^2 + 188535^2 .

It is a cyclic number.

It is not a de Polignac number, because 221675565409 - 2¹⁹ = 221675041121 is a prime.

It is not a weakly prime, because it can be changed into another prime (221675568409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110837782704 + 110837782705.

It is an arithmetic number, because the mean of its divisors is an integer number (110837782705).

Almost surely, 2^221675565409 is an apocalyptic number.

It is an amenable number.

221675565409 is a deficient number, since it is larger than the sum of its proper divisors (1).

221675565409 is an equidigital number, since it uses as much as digits as its factorization.

221675565409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536000, while the sum is 52.

The spelling of 221675565409 in words is "two hundred twenty-one billion, six hundred seventy-five million, five hundred sixty-five thousand, four hundred nine".